Poor dd ignored

Are you sure that this is not just a case of your DD not getting as much attention as she has been used to in the past? If so she has to learn to deal with it. She can’t always be the centre of attention.

I wonder if the leader regrets her initial attention to DD and has decided to rein it in. While being ignored altogether is too far in the other direction, I'm not sure it's entirely realistic for one child to expect to always be made much of, permitted to hold the floor with their jokes, to thrive on the attention, because it could lead to quieter children being overlooked.
So it's possible the leader is making a clumsy attempt to lower your DDs profile and let other people shine. It's also possible that your DD having been used to being made much of, sees being treated as one of the crowd as a being ignored.
If I were you I'd ask for specific examples from DD and view them through an objective lens. If you feel the leader is doing something wrong then I'd address it with specific examples. Like, DD says that when she asked a question you didn't respond. DD said you gave every other child but her feedback etc.

I think this is a good suggestion. Swing it so it’s not a criticism of the leader but ask them to boost your dd’s confidence

So if it's a case of not getting feedback then I would raise that side of things. Sounds like it's a dance club or something so if everyone else is receiving feedback on how to improve then your DD should too. I would put it across in general asking how she is getting on, as she hasn't been given feedback in a while so presumably she is doing well/making the grade etc.

I think it was @Tacohill that talked about their personal experience with this ☺️

A good teacher would be prompted to reflect on how they are interacting with all their students and consider if they have, in fact been ignoring one particular child. They should then adjust their methods accordingly.
This person doesn’t sound like the kind of teacher who will react like this though.
How much training or experience has the leader had in how to handle young people. How professional is it overall? The trouble with lots of activities for kids is that they’re sometimes run by people who have little training or the personality to really do a consistently good job.
Personally I’d be building up my own DD and waiting it out to move. Then when she left I’d politely let the leader know how she has made DD feel and that she might want to think about how she approaches her relationships with the children.

i’d speak to the leader now, like the day before they go back or something so it’s fresh in her mind, and say along the lines of “dont tell DD i said this, but could you give her a bit of confidence and praise now and again it might help as shes needing a wee boost. it’s a difficult age. stuff happening. weve all been there. thanks”

Is it possible that another parent has complained about how they may have favourited your child in the past and therefore the leader has responded by completely ignoring her?
I think I would have a chat with the leader myself. Probably just make it a ‘how is she doing’ kind of chat, maybe mention that she is not sure if she’s improving lately and is there anything she can be working on to prepare for the next level. You might be able to get a sense of what’s going on, if anything. Then I would just wait it out until she moved or possibly ask if she can move early maybe?

At first, DD received lots of positive feedback, she was asked to demonstrate activities and told she set a great example for younger participants.

It sounds as though she got too much attention at the beginning.

If it was regularly just her being asked to demonstrate etc another staff member or parent may have flagged it up and basically suggested that it was not right.

I had a situation where I was giving a bit more attention to one person because they were qualified in a certain area and was really confident demonstrating things.
Other people got jealous and it was implied that I was favouring this person and so I was very conscious of giving them too much attention and it resulted in me essentially almost ignoring them.

I wouldn’t say anything else it could go bad for your DD.
For now, I would tell her to just keep her head down and carry on and then think about mentioning something in a couple of months time.

I am so sorry to hear that your child is having this experience. One important thing to take from it, is that sometimes your face just doesn't fit, with a company, a group or a person. There is nothing you can do to make it better, just remember that there are other people in your life who appreciate you, leave or accept.

If you saved the building from burning down the others who ran off would get the praise!

The leader probably doesn't like her much. Personality clash. Maybe they feel your DD is seeking praises too much so is going the other way around about it.

Could she ask for feedback on some specific aspect of the activity as a way of getting back on the leader's radar? If it's, say, art, for some feedback on her use of shading or any tips on getting noses to look right or whatever?

No child should be completely ignored.
To say though nor can any child expect to be in the spotlight all of the time. To have all the attention and praise. If they are used to that then if it stops then yes, the child will think there is something wrong.
Some children are super confident and coaches might think the last thing needed is actually any more praise.
They also might be focusing on children who are less confident and self assured.

In my experience immature adults who ignore anyone they don’t like are a) very easy to offend and b) when you talk to them about it they pretend it’s not happening. I would not put it onto your daughter to say anything, and if you say something, be prepared to have to leave over this, as it won’t be resolved like mature adults.

So she's not in the spotlight anymore as much? Other kids are getting attention too??

Is this the case?

That is a really tough situation, your poor DD. It sounds like the leader lacks a lot of skills and empathy unfortunately. I don't blame her for being inhibited, she's picking up on very clear signals from a leader who doesn't know how to lead. My guess is that your DD inadvertently said or did something and the leader is punishing her in some way. I know a few adults like this and there really is no point in trying to approach them as they can't handle criticism at all.

It may be that your DD has to just ride it out for the next 10 months. I doubt you getting involved will help things tbh.