Originally Posted by ga tennis
Her coach thinks that she needs to play tournaments for the mental and psychological development.
I agree with this sentiment. Learning how to win is a skill in and of itself. Some kids have it naturally, others take longer to figure it out. That's what you see in 12's all the time. Girls with happy feet and confidence and no technical skills beating kids with perfect strokes. Shot selection under pressure, etc. dealing with the isolation, etc. I think she needs to play, and after she has played maybe you can be a better judge of how much she needs to play based on what you and your coach see and what she's getting out of it.