Thanks for sharin' buddy
My initial response would have to be, don't pine just yet. You haven't known her for that long, but you've helped through some intense stuff. A bond is in place. She's not likely to forget you anytime soon, so don't worry. You have her number and e-mail for the summer, or however long it is... Keep in touch with her, and go visit her on her days off, if you can. Maybe she can come visit you for a weekend at some point? consider this summer a dry run. If you can "keep it together" until August, there's a chance you could do the same when you go off to school.
Most importantly, don't put her on a pedestal. That opens you up to that nasty heartbreak you mentioned. Get to know better.
Good luck.