I didn't even know it was one of her fandoms until I told her I was going to see it last weekend, and she piped up that she'd like to see it too.
Last night, pretty much the first thing that happened after she'd got back from her silent retreat was that we had an indepth discussion about the continuity of the Avengers universe. Well, I asked questions, she gave the answers. :-)
Is it terrible that I had no idea that X-Men and Avengers existed in the same universe?