hey bro, sorry to hear about that. About the lease. If she signed it also, then it is a legally binding contract. You can take her to small claims for the money but you will not be able to sure her for any monies that you have not, yourself paid. I'll explain. You cannot take her to small claims court and sue her for future debt. You can't do this for the simple reason of you or herself subletting the apartment or whatever. Since your a co-signer, you will be responsible for the monies that she does not provide, but you can sue her. I think your best bet would be to contact and attorney and see what they have to say but you will not be able to sue her for the total amount of monies lost until the end of the lease. i would recommend that you just try to sublet the apartment yourself. it will save you time and probably money, not to mention time wasted and a potential for an undesireable outcome. Good luck and take care.
Dan Parker