Clueless parents
I get that everyone is talking about the parents, but the mom finally did recognize something was wrong-just guessed the wrong problem. And if her grades weren't slipping and she was still on the dance team, I feel like they didn't have much to suspect-espcially with them focusing on the son so much; deeming that he had all the problems.
Anyways, I think it was weird that her friend didn't confront her, or the dance coach didn't apporach her sooner. They practiced so much the coach could obviously see something was different. At least talk to her, and then inform the parents of her suspicions (way sooner than she did). And I feel like her friend had to suspect something was off, epecially when she started hanging out with the new "crowd".
I don't know, maybe that's just me.