Hm, I’m not quite empathizing with that last thing she said.  I understand the stage fright and lack of confidence, but playing off stage? She’s being a wuss. Whatever, yay for character development potential, ig.
Edit: Imo, this is a wildly different issue from creative blocks. She's just self-sabotaging by saying she can't do it (not true), which is just gonna lead to a self-fulfilling prophecy if she keeps up that attitude. Obviously that's not gonna happen bc char. dev., but still.