Perhaps her new coach would be willing to give her contact information on some of the current and '04 players. Your daughter could then call or e-mail them, asking questions about classes, adjustments, etc, and make the whole prospect of being there with girls with similiar interests more real. Right now, she knows the facilities and coach...but the rest of it is pure unknown.
Help her get ready for the experience with all those life skills she'll be handling for herself - maybe for the first time: budgeting, balancing a bank account, laundry, grocery shopping and cooking if that's part of her accommodation, making preparation for her new adventure a family project, and reminding her how much you'll be there to support her.
It is a scary prospect, but an exciting one, too. And then there's always the question when one has cold feet about a change in life: what's your alternative?
Best of luck!
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From 'Nice Guys Finish Last' by Leo Durocher:
Baseball lives at the center of a never-flagging whirl of irreconcilable opinions.