I want to break up with my girlfriend as soon as possible but she is gonna be gone for another week?

I want to break up with my gf but she is in el salvador for another week. Shes been gone for 3 weeks and i dont like her like i used to. we were only going out for a week bfore she left. So i was wondering do you think its right if i do it on myspace or txting, especially since thats how the relationship started. Plus if i did it face to face the soonest i could do it would be the day she gets back, and i have to spend the whole day wit her then. I just tought it would be wrong to spend the whole day with her just to break up.