She called Miller upset about what had happened and the two met at a college party later.
Sarah says she only had two drinks that night so her memory of what happened when they went back to her apartment is 'crystal clear'.
On two occasions, she says Miller beat her and sexually assaulted her - including punching her in the face during sex and raping her with a beer bottle.
The claims have been whispered about in the comedy world since 36-year-old Miller rose to fame as a stand-up comic after graduating in 2003, but Tuesday marks the first time the victim - referred to as 'Sarah' - told her side of the story to a news outlet.
Instead, she says she 'froze' because she 'wasn't prepared' for what was happening. The next morning, she came down to find her roommate having breakfast and both said they noticed bruises on her body.
'I was not ready to process what was happening [the prior year], and I have spent a lot of time in my life apologizing for not having shouted 'no,' and for not having told my roommates to get him out of here,' Sarah said.
'I was not ready to reconcile the events taking place with the person I had known.
She was also especially invested in their relationship because she had lost her virginity to him.'I couldn't bring myself [at the time] to believe this had happened,' she said.
'It was me not wanting it to be true.'The second assault happened a few days later, when she learned that she would not longer be participating in their improv group.