competition. I used to get the same nerves. Not to sound like a brag, but I was always the best player on every team I played for through little league and HS, so I felt more pressure to succeed and do well. I knew the box and ones were coming, I knew I wasn't going to see any fast balls, etc....and I would fret about not being able to live up to my playing potential and let down teammates.

Even today I look back and wonder how different my life would have been if I was a simple role player off the bench. She may be carrying too many expectations for herself and from you and those around her. The fear of letting you all down could be too much. I'd look into that angle.