Is this discrimination?

[Halloweenrainbow]

DD6 was previously assessed as having mild delays in speech and language, delays in gross motor skills, was slightly late to crawl and walk etc, but has 'normal' intelligence and does make progress in her own time. The pediatrician concluded that she had these 'delays' but DD was never given a diagnosis as such. She repeated a year at nursery to give her time to catch-up. Mostly her progress is fine - just a bit later. However, now that she is older these 'delays' are causing more problems for her socially. She has been denied access to clubs/groups based on her difficulty with certain activites and physical abilities not being age appropriate in their view. I think she would be fine except maybe choosing to sit-out at certain times but would otherwise not need any adjustments.

In this type of scenario, can I challenge it as discrimination and draw on disability rights, equality laws etc if there is no formal diagnosis? Hope this makes sense.

Ps - sorry for being a bit vague - trying not to say anything too identifying.

Privately run clubs such as gymnastics/dancing which are run as businesses can do what they like. They can and do make excuses. team sports and swimming the same. In particular we found swimming lessons very lacking in understanding. The council pool was the worst! I was told that equality legislation with regards services is hard to enforce when its children. Lots of things like swimming are oversubscribed. They'll fob you off. They also want success as other parents want that. Your child may be dragging that down and it impacts their 'brand'. I say that as the parent of a child booted out of multiple clubs (he has a variety of diagnoses).
State or charity run organisations should have more of a duty to make adjustments and might be openly trying to do so.
If its something well organised like Scouting then there is a process and a hierarchy you can appeal to and at district level trainers and commissioners. there's ways to escalate the needs of your child. But if things are volunteer run (like scouts and football) then unfortunately volunteers are hard to control and not understanding always. So even Svouts struggle to get their leaders all following training. They don't go into volunteering to specifically help certain children sadly.
I wouldn't bother again with private swim schools or competitive football or private clubs like art or gym. We were burned very badly over several years. It took us a long time to learn our lesson.
In the end we started seeking out disability specific activities.
We stopped trying to join the regular clubs. the disability football actually boosted our son's confidence where as the mainstream stuff dented it. Most things are now SEND not 'disabled' and a mix of abilities attend. They try to make it affirming.

You don't need a formal diagnosis to ask for adjustments. A decent organisation will do it. If they won't even discuss you are flogging a dead horse.

Not sure about where you live but our local David Lloyds has been excellent. They manage DS4 meltdowns during transitions and definitely try their best to include him. There are other SEND children who attend including a girl with Downs, a non verbal boy aged 4 and another child with severe autism. Swimming and tennis lessons were tricky as DS doesn't like listening to instructions. Some of the classes are more playful in nature like dancing and cheerleading but it's allowed DS to mix with NT children out of school.