Why do some people make excuses that they are too busy for a relationship or use college as an excuse?

My friend is 27 and hasn't dated in 5 years. She had plenty of time to figure out herself and she has been single long enough. I tried to hook her up with guys or tell her a guy is intrested him her. She turns it down and said she will date when she is ready. I was so dissapointed because there was a guy I told her about a year ago that would give her dad his blessings. That could have left her with a wonder future together. I told her to let me know when she is ready. She never does. She always does this and plays games. I understand she has school but she is only a part time student. She is just making excuses and using school as an excuse. I don't know if she is taking summer classes but she has done it long enough. I know she has a lot of assignments to do right now but she should use college as an excuse. She is going to miss out on wonderful guys even it may lead to marriage. I just want her to be happy. Is it because she is autistic doesn't mean she can't have a real relationship. I think she is scared. She is three years from being 30 and she needs to start thinking about if she wants to get married of have children. Time is ticking. Her brother is 33 and so am shocked that he has no girlfriend. But my friend is a woman and no body especially a woman should end up alone.
She said straight up that she is happier single right now but honestly I think she is scared. I don't believe her. Nobody is happy single.