Thats horrible! :[ I would call the housing department of your college and talk to them. Maybe if you agree to sign something of some sort (like an agreement contract or something) you could take her with you. I mean really, how much damage can a small fish tank cause lol. Usually colleges let you have tanks... Mine lets you have anything under 10 gallons.
They might say no if you ask, but its worth a shot! (And not everyone follows the rules... I have a friend that brought their rabbit and was never caught lol)