D.B.
if you haven't found the local dance or cheer studio you both feel comfortable with, keep looking, keep her enrolled and engaged there. Also, you talk, talk, talking with her about her past accomplishments will remind her she has achieved and will again.
I raise my niece, who is now 16 1/2, and she was really good at dance and gymnastics and swimming, then she fell and broke her arm---lost her confidence. She failed a class in school. That summer she aced her summer school class and took up dancing again and I kept pointing out to her and asking her to share with me how that felt, and she could see she has it in her to achieve, to have fun, and to be back in the game of life. She changed shools this year & recently she auditioned for a play and got a part! She has several new friends that I approve of, too.