My ex did something awful

My friend finally broke down and told me that my ex boyfriend, someone she trusted, and someone i never thought would be this disgusting, had raped her one night after she got drunk and passed out at a close friends house that her and my ex would hang out at. Him and I had met through her and when we broke up, we actually had a pretty good friendship afterwards and i had a lot of respect towards him. So it wasn’t weird for them to hang out a lot. Well, when she was black out drunk, she fell asleep on the couch and was out cold for the rest of the night until her other friend went to bed and left her with my ex(she is impossible to wake up when she’s like this, so she could not have just woken up and given consent, she wouldn’t do that any way and is definitely not like that). The only thing she remembers is her face being pushed into the couch and being in a ton of pain. The next day comes and she wakes up super confused and naked next to my ex. She immediately just assumes they had sex and tells him to say it never happened. She felt guilty and disgusting and couldn’t figure out why. When she started to ask questions is when she found out that there wasn’t much consent involved. She also discovered he did not do it vaginally and he definitely didn’t use lube because she was bleeding and sore for two days. I know her and she would have never consented to having sex with him, let alone do anal. I blocked him on everything. She doesn’t want to confront him about it out of fear of being embarrassed and taunted at work about it because she’s already going through so much shit. I wish she would, but i know it’s her choice. How do i comfort her about this? She’s very dead set on not going to the police, it’s too late at this point. I just don’t know what to say to her about it when she brings it up, I don’t want to say the wrong things