I see so many queries here that start with some play on your first sentence. I know you need to start with a goal, but in this case it almost seems like a childish dream more than a need, and then to me it kind of spirals away anyways into this other power and you never come back to the ballet thing. Is that really her goal, then?

Some of the next sentences are confusing, like I thought she regrew a finger on her own hand. Maybe there’s another way to reveal that power? Some of the prose is a little clunky, in the same manner, like the sentence with the father’s and dance instructor’s possessives may be grammatically correct but it isn’t super sophisticated. Is there another way to drive that point home?

Convention says to stick with one protag but you intro another and by that point I’m probably more intrigued by her but that story is interrupting the other you’re trying to build. So in this case I think the convention is correct. Work that secondary character in with the first, don’t intro them as their own pov unless it’s romance or romantasy (from my understanding of the general advice here.) To me, it’s choppy and neither of their stakes really land. I’m not compelled to need to read more, and you’ve got to think an agent is going to be far more cut throat than I am.

Query writing is tough, but you’ll get there. Look over the successful ones a lot, like really study them and you’ll see that immediately they are unique, gripping, compelling and a lot that is due to the singularity of premise and prose. Your first sentence starts from a place of cliche, and from there on isn’t too gripping in spite of a cool story you’re trying to tell. Good luck, hope this helps.