If I DID sign a non-compete and my employer didn't mention it when I quit… is it relevant?

I worked for a very small local company for 6 years. In December 2010, I told my employer that I had interviewed at another company and was considering an offer (I was in a key role and wanted to give her time to figure out what to do). I told her exactly where I was thinking about going and what kind of work I would be doing. She cried, told me I'd regret it forever if I didn't take this great opportunity, and said she would probably sell the company because she couldn't imagine doing it without me. By the time I resigned in January with one month's notice (and full disclosure of where I was going), however, she had decided that it was an unforgivable personal betrayal on my part and she was furious. We made arrangements for me to finish my major projects within two weeks so that she wouldn't have to see me anymore, and I've been at my new job for about 90 days.

Apparently, she is still very angry (she's like that). Recently, in a conversation with a higher-up at my new company, my old employer made a vague, threatening comment about a non-compete agreement that I may have signed. I have no recollection of signing a non-compete, but that doesn't mean much -- I don't have a great memory for things like that; on the other hand, I'm certain that she never mentioned a word about a non-compete in any of our conversations about my leaving.

Primary question: If there is a non-compete, does she have an open-ended right to file a lawsuit? Would there have been any obligation on her part to at least mention a non-compete before I started work for the new company?

Secondary question: Should I ask her for a copy of any non-compete I might have signed?