Don't take it personally. The kids' gotta want it.....the parents wanting it isn't enough.
When my son quit, at 14, he spent 6 months in 'self sabotaging' behavior, but he was not doubting himself, he just didn't FEEL like doing the Tsuk, or working on pommel circles......then he had tons of psychosomatic pains which he crafted so he could avoid certain skills. His wrist always hurt for high bar. But he wasn't doing all this because he was a lier, or being manipulative and he certainly didn't realize he was doing it......his pains were very real.......he was 14 and could not imagine life without gymnastics since he had been doing it since he was 6! But he hadn't figured out that he didn't want to DO gymnastics....when he realized, he retired......
I still think he will regret it later, but I can't MAKE him do it.....HE has to want to do it.......
For the adults, it's very hard because we can see things the kid can't, but that's the kicker! Is young lady needs to figure it out on her own.