I know one or two things about 'mean colleagues'

It was my ex-room mate, he made my life hell with his passive aggressive fixation on me, he never said a thing, but still made me feel horrible.

They might eventually stop when they realize it isn't affecting you. For that to happen, you have to focus on your own work and not let them get to your head. I never a said a thing to my room mate, and he felt bad and apologized later, it meant a lot, and I don't hold grudges at all.

But then again, there are people that feed on other people's low self-esteem to make them feel better about themselves too. if it gets too much and it's starting to affect you or your work, maybe you should speak with her again, or tell your boss. Hard decisions have to be made sometimes. If it continues this way, I don't see how you can co-exist for 8 more months.