OP: Quite honestly tell her to go choke on a dic... no she probably does that anyway, sit on a cactus!
I can't even remember howmany times I was tricked like this "uh come join my chat/messaging/blog/face/gaming... bullshit, we can hang out and bla bla bla", fuck that sh*t, it goes nowhere you are simply the dupe she now has by the balls.
Play the game if and only if you want to, girls should be a non factor, you haveto remember they want men not muppets, she surely would feel better if you do her bidding, but forget about a romantic relationship when you do.
As for WoW, played it for some time, it surely is the best MMO, but that is like saying it's the best STD (they are all bad for you).
It is directly designed to keep you there forever, and 95% of it is tedious bullshit that just wastes your time until the month is over and you shell out another $14, then buy some expansions,... and so it goes on.
Actually it be better to get a second job, it wastes less of your time, is about the same level of fun, but they give you money not take it.