Personally, I think her support should be based on results instead of appearance or fitness level. If she is fit enough to win in the juniors she is fit enough to compete.
But, I don't have a problem with her coaches telling her quite frankly that your fitness is hindering you just like a bad stroke would hinder you and we are going to work hard to improve it.
They are trying to transition her from promising junior to world class athlete and she is not going to make the transition carry a lot of extra weight. It hurts but it is the truth. This is not little league - they are talking about the big league USO.