Why does ally dawson have stage fright?

Answer 1

in the episode "Filmmaking and Fear Breaking" she tells austin that she has stage fright because when she was auditioning for something she was excited but after she thought that the piano was eating her hands she was so embarrassed..

Answer 2

Because one time she was performing to get into the M.U.N.Y., Music university of New York, a very prestigious music school, and the judge put so much pressure on her that she felt like the piano was going to eat her hands if she played. It's a weird story, but it's introduced in the episode Filmmaking and Fearbreaking

Answer 3

Too soon to tell.

It will be revealed later on in the series.