That sucks man. What could she possibly do though? Not to doubt the very real threat, but just to reassure you. College should be a very different experience for you, depending on what she actually did I mean. I know it's similar in a way to high school but I'm positive you'll be safe from any sociopaths. Just be yourself in spite of everything and the truth will always come out--and if it doesn't, the people who like you for you (because you're being yourself) will stick by you no matter what others say.