2. She doesn't like his girlfriend.
Okay, so she may be her sorority sister and all, but your lady is not too fond of your boy's girl. You know firsthand that his girlfriend is a sweetheart and whenever she's around, she has nothing but the nicest things to say about your lady. Still, she just doesn't like this new girl and can't really give you a good reason why.
We have an idea. She wants her spot.