You know, I'm not trying to make you feel bad here, but I wonder if that's the kind of question that needed some lead in? Usually when I meet a co-worker or acquaintance who I haven't spoken to in over a year (particularly if there is alcohol involved), I tend to be a little more conservative about how I bring up topics.
For example, in that situation, I might have said something like:
Hey, remember how you used to tell me all about your half marathon training? I just ran my first 5k...are you still training?
With those sentences you have:
1. Queued her memory.
2. Showed how that particular topic is relevant to you.
3. Asked your question.
That kind of approach also tends to be a more fertile conversation starter with people who I haven't spoken to in a long time.
Finally, this is harsh advice, but necessary to hear. One of the keys to people is understanding that some people are significantly more important to you than you are to them. You may use the phrase 'more than acquaintances' to describe your relationship to her. She may refer to you as 'some guy in IT'. Or, maybe she has never referred to you because you just aren't that important to her.
That isn't bad though, because it is just as inevitable that you are significantly more important to someone else than he/she is to you. Heck, 'that person who serves you coffee' may refer to you as 'le-mark le drool'. :)
Point being, our operating systems aren't all compatible.