This really reminds me of my brother - he was really self conscious of his weight (and my dad didn't help that fact) until he was 15. He shot up within a year and has almost looked too skinny ever since.
He was a chubby kid his whole life - he did footy and basketball - ate as well as he could - but he would never really lose the weight like he wanted to.
He has never put weight on again since he grew tall but I think that had a lot to do with how hard he tried to lose it for years when he was young - he is very into fitness now.
I agree with the food diary thing - either let her do it so she doesn't have to tell you or do it together. If she is eating right with only a few days exception it might be a hormonal thing in the end.
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