guild wars is good. it's online and looks great. no monthly payment you can group with her as well as others. you can explore a new world together. also females tend to like games that have social interaction more.
Dungeon siege and dialbo are good easy to learn games.
if you want really easy games a gamecube with some coop/party games or wait for a nintendo revolution. Super Smash brothers is very easy to learn but tough to master.
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