Do you see Faith as her name or Girl? She doesn't appear if her name is not displayed when you talk to her. Other guys mention her name during your conversation.
Make sure you don't have sex with her till the quest ends.
- First, banish the ghost in Evergreen college then wait in the lobby for some time until they appear.
- Get her name from one of the boys. Go to portal room and use this combo (left-sun, right-sun,up-sun, down-wind). Once a door is opened go through it.
- You will come to different version of university and Faith should be standing outside. Talk to her and tell her the truth.
- She will ask you to give her a dark mirror. Give her one and come to college level again and her quest is complete.