You're 100 billion percent correct right there, lmao
She hasn't been to many (if any) concerts on account of her upbringing so when she goes to one (to catch up on what she's been missing out on and she sees a beachball thrown around the crowd, her first impulse is to (quite literally) join in on the fun!
And she's having a ball with it too, being tossed all about from one point to another roughly fits the same adrenaline experience she gets from doing her infamous "bouncing from a high height" move in parkour.
And she loves the attention she's getting from it!