yeah, champions of norrath and dark alliance seem to be the real winners... they seem to like hack and slash games, especially when they can get away without worrying too much about things other than move, and attack (not being sexist). mario party and warioware also go over well, maybe mario tennis too... and mario kart... well (almost) anything mario
beatmania and guitar hero also seem to be winners... and donkey konga of coz... tried one of the marvel hack and slash games and it didn't go over well, i guess it was that first one that you guys are putting down. there's also a fallout game in the same vein as norrath/dark alliance... it was alright... but also didn't go over too well.
really, it's an area of gaming where things are pretty lacking... and i'm not 100% sure the developers are to blame... pretty hard to make something co-op that both sexes can enjoy... especially if playing skill levels are far apart...
you can always con her into trying WoW, if that's something you would enjoy... seems pretty hit or miss, but it seems to me that it's a fairly popular-ish genre among women. at least, compared to other genres... i'm sure the male population still dwarfs the female