About other child at playgroup?

[TrustyPatches]

More of a WWYD! My DD is 3 and is very sociable. We attend playgroups regularly, however I changed the time slot at one of our regulars so we aren't friendly with as many people there although I do go with a friend and her child (who is a good friend of my daughter's) and know one or two faces.
For the past two weeks a little girl (similar age or slightly older) has been very rude and unkind to my daughter, even when I'm right there. Think "I don't like you", "you can't play", you're not my friend" etc. Typical I suppose and I know it happens but it upsets her deeply and I don't understand the cause of it as she's not trying to play with this group of children. I say things like "Please don't speak to her that way/I don't think she likes that so can you stop please" and it stops for that session but my DD will be weepy and emotional for the rest of the day.
She loves this playgroup other than that 30 second encounter so I don't want to dent her confidence by not going but I feel like I'm not doing enough. WIBU to speak to the child's parent? What would you say? She doesn't supervise, often sits with her back to the children but I have noticed this child is paired off with another and they are unkind together. They have been rude to me and other parents/children at the group too!

Tbh I'd ignore the little shit other child and address my own child loudly enough for everyone to hear, "don't worry sweetheart, ignore that girl, some people are just horrible."

That might seem a bit mean but she is actually being horrible and it's good for your DD to learn some people are just horrible. 🤷‍♀️
Your also explaining to your DD rather than just calling the other child horrible to their face.

Pequena obviously they are very young to be throwing the term "bully" around but this child is targeting mine for seemingly no reason. Just curious, would you have the same response if they were older? I'm not bothered who likes her and who doesn't, as you say that's life. But inclusion and tolerance are what I'm trying to model for my child and it's frustrating when others don't do the same. I would be mortified if she'd said those things to another child for weeks on the run.

No, I wouldn't find it funny to find out a child was suffering.

I do, however, find the higher and more shrill levels of hysteria fairly amusing, especially when the issue being presented to me is a non-issue (no, this is not a non-issue, but I have dealt with several non-issues presented in full blown hysterics).

I want to help. I want to fix things. But I don't want to be shrieked at, and it's better to laugh than to cry.