yeah gmram is right on.....you basically have four scenarios:
1) you don't tell her, she goes home, and you spend the whole summer wondering. of course you won't spend the whole summer wondering, you'll call her and tell her you love her over the phone(if you got her phone number which i'm assuming you did), she'll feel the same way, but there won't be anything either of you can do about it til you see each other again, and it won't be near as cool as if you'd told her in person.
2) you don't tell her, wait, call, and she doesn't feel the same way, and you will feel like a dumbass for not getting it over with earlier.
3) you tell her, and she doesn't feel the same way. at least you know, and you can spend the summer with a load off your chest (hopefully)
4) you tell her, she feels the same way, and you guys have killer sex multiple times right before you both leave.
you just got finished with your first year of college, so i'm sure you're all too familiar with multiple choice tests. tell her now, don't make a humongous deal out of it, and don't spook her out, just tell her all the things you love about her and leave it at that. we have faith in you
-Strode
Abba Zabba, you my only friend