I've been giving this some more thought after watching it a second time.
Quite obviously they carefully rehearsed the whole thing from start to finish and went over the moves again and again with her, and the thing is, she's absolutely brilliant. She hits the moves crisply, she has all the movements and expressions, and she sells brilliantly. On one level its "wow, this is fantastic, good on her, she's great and bound to be a wrestler in the future. Well done to them for giving her the chance to do it"....
...but on the other hand, it just seems...wrong. I think nine is too young to be in a ring anyway, and really, there is something quite disturbing about seeing a grown man "beat up" a nine-year-old child (even if it is a set-up). After you get done being impressed with how good she is, it starts to become more than a little uncomfortable. Its just not a visual I'm totally happy seeing and I'm not convinced, overall, that it was a good idea - however good she is.