Im not sure what to do.... but try to make her feel happy so she wont be stressed about it.
That is a drag! I think they can fix it surgically, but it will take a considerable amount more surgury to repair it now if it's been 3 years. They'll have to debride (cut away the scab material) and reattach it - it will also take months of recovery for her. She should have it looked at by an orthopedic surgeon - not a regular GP - did the sprained advice come from your regular family doctor? - he/she has not been on his/her toes if he/she had not suggested this 2 1/2 years ago!!
You might research out orthopedic specialists who are the best and try for a second opinion? I imagine some who are the best are the ones the sports stars go to for help.