I moved out at the end of a lease that I shared with two other roommates. I handled the utilities. When I moved out, one roommate had not paid for 3 months worth of bills. 2 months later, she wrote saying she won't pay, citing: (a) she was out of town for 1 month so she did not use any utilities (not mentioned before the trip) (b) 2 visits from my family that she did not want (not brought to my attention during their visits), and (c) a gas disconnection for 2 weeks (happened because both roommates had not paid me, so I didn't have funds to pay the full amount, which I told both roommates 1 month before the disconnection.) Can I take her to small claims over this or is there some other recourse? I have all communications in writing, but no written agreement re: utility paying.