About the examples of orthodontia, acne medication, and contact lenses, I disagree. Orthodontia is done on kids (not that young, mind you) because it needs time and you move teeth etc. so rather do it while things are evolving than after the fact. By the time somebody "needs" it, adolescence, it would be frustrating to only start then. I had braces from 10 to 15 and in the end I was really glad to get rid of them (and of the result). Acne, even mild, can lead to permanent scarring, not something you'd want. It also isn't about 7 yo kids. So, those arguments fall flat.
As for contact lenses for kids, I don't think that's a good idea and justified in any way, so that argument is void too.
Now about the ears, the problem looks to be the mother, it was her idea and she influenced her kid. Even if bullying happened, I don't think surgery was the best way to handle it, rather make some education on the kids, and teach the girl that she shouldn't care about those bullies, she's not deformed ! And she's got the long hair to mostly hide it. I wouldn't be surprised to learn that she'll need a few more surgeries after that first one because she'll grow up and it will mess the modification up.
New Technology is the name we give to stuff that doesn't work yet. Douglas Adams