<human>: Can you give me the gist of the text in a nutshell?

Last year, I met my girlfriend during the summer. Everything started out great, and then she went out of state for school. When she came back during winter break and spring break, things were great too. 

However, since she's been off school, in the past week, she's picked up twisting my nipples, trying to shove fingers up my asshole whenever we're naked, sometimes makes random lunges to hit my genitalia, and she'll randomly hit me in the head or slap me. When she's not doing these things, she's great, but recently, it's been getting too much.

Recently, when i got back home after seeing her, I've been feeling pain in the areas where she's been hurting me (nipples are tender, slight tinges of pain in genitalia). And when i told her about it over skype and told her to please stop hitting me, she just ignored me. She just generally acts like none of this is her fault. How can i tell her so that she'll stop hurting me?
<bot>: gf of 11 months comes back from school, recently picked up habits of hurting me. how do i make her stop?