Yes, you could sue in small claims court. Because you have her signature on the list of damages that pre-existed your taking over the lease, you have proof that you did not do this damage. This is a pretty strong case. However, be sure your former roommate is collectible before spending the time, effort and money suing her. That is, does she have assets, or a source of income shuch as a job so that you can collect your judgment?
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YES you can sue her.
Get the judgment and later on when shes
working at a decent job you can garnish
her wages if she refuses to pay you.
THIS ANSWER IS PURELY FOR ACADEMIC DISCUSSION ONLY AND DOES NOT CONSTITUTE ANY TYPE OF LEGAL ADVICE OR LEGAL REPRESENTATION.