Roommates: My Roommate Skipped on Her Last Month of Bills

My question involves landlord-tenant law in the State of: Massachusetts

My roommate moved out at the end of her lease in April. When asked if emailing the bills would be OK, she said fine. I emailed them twice over the span of several weeks but got no response. I called the number I had for her, but the voicemail was not hers- she had changed her phone #. I did not have her current address, but I knew where she worked and phoned there. She said she was with a customer and would call back. She never did. Meanwhile almost two months have passed since she left. Feeling I had exhausted all the alternatives I went to her workplace with the bills and some mail that had been coming in her name to the house. She called me, "rude" for coming to her workplace, snatched the envelopes from my hand, and ran to a back room. I was stunned.

No payment came.

She was an exceptionally quiet roommate and we did not cross paths often. Twice during the year I asked if we could discuss the electric bill. She was leaving her air conditioner on during the Summer when she was at work, and in the Winter she was doing the same thing with the baseboard electric heat in her rooms (her two top floor rooms the only ones in the apt. with baseboard electric heat). Our electric was spiking on these occasions. This was an effort on my part to conserve energy and save the both of us money. Reasonable, I thought. I felt that these issues were handled maturely and satisfactorily, but would later learn that she held this against me and was part of the reason she refused to pay. The other reason was that she did not feel the 2 cord of wood we purchased the previous Summer for heating purposes downstairs was used. It was.

I learned these things not from her but her boyfriend, who called me a few hours after I tried unsuccessfully to contact her a second time at work (this being about a month or more after my stunned exit from her workplace)- She hung up on me when I introduced myself and mentioned the bills. When I called back she could not be reached. So the boyfriend called, and I was happy to finally get some sort of explanation for her behavior, which had me absolutely perplexed. He told me she had no intention of paying the bills, for the above mentioned reasons.

When I said that was not leaving me many options and that I would be considering small claims he threatened to file a harassment suit and also a restraining order against me. I plan on filing the small claim for the bills based far more on principle than for the money (less than $100) after being disrespected by both her and her boyfriend. My question is will my email and phone records be enough to protect me from a harassment suit should they file? I emailed twice, phoned twice, and saw her once during a 3 month span. In all these instances I feel I was courteous and behaved like a mature adult. Note: she is in her mid twenties and I'm in my thirties. And if they bring a malicious suit against me will I have grounds to counter with slander (defamation of character)?

Thank-you in advance of any response.