Your sister might have had condition known as anotia for which she has undergone pinnaplasty...its a very difficult procedure and results are many times unsatisfactory...there are very few surgeons who master the art of total auricular reconstruction. You can contact Dr. Ashish Bhoomkar from nasik who is good at this procedure. Otherwise she can go for something known as osteointegrated prosthesis where artificial ear is fixed and it also gives very satisfactory outcome