What to do about my girls WOW addiction?

I have been with my girlfriend Cristine for 5 yrs, and in 2006 she began to play WOW beacuse a friend of hers said it was good.i didnt mind at first but now she plays 48-96 hrs at a time, without sleep!, she takes showers once-three times a week and she has gained 91 pounds in 7 months because she eats and plays, she literally leveled a mage character form 1-47 in 2 days!, i cant take it anymore, im a nice guy and i have a feeling if i dump her she is going to go into some abysmal depression, what should i do?