My friend has delusions and nightmares of somebody raping her. How to help her?

Hello doctor,

My friend undergoes frequent delusions and nightmares about some men raping her. She is 20 years old now. When she was around 10 years old, she went to a wedding ceremony. She made friends with a boy much older than her. He took her to someplace on the very same day telling her something nice and all. Then she saw four to five boys standing outside a dark construction site. She fainted then and after that, she only remembers waking up. She says that all these are coming back now because she is curious about what happened to her that night. Her delusions and nightmares were triggered by a rape scene she was seeing in a daily soap recently which made her remember the incident.

What is worse is that if she gets to know what happened that night, and if it is really something that bad, she might commit suicide or hurt herself. Recently while I was at her place, talking about these problems, suddenly she felt dizzy and sat down, and then she stared intently at the entrance for at least five minutes if not ten, after which again she was normal but she does not know any part of the time when she was looking at the door and thinking something. I am very much worried about her. Please I need some advice about what can I do about and how can I help her? She is in so much of pain. Please help.