I feel responsible for her getting pregnant. What should I do?

It was our senior year of high school. We had liked each other for 3 years, but never went out. She had a hard time with her family and ex-boyfriends, but she was smart and beautiful. We got close towards the end of the year and she ended up asking me to take her to prom. I was too scared to say yes and she ended up going with her boyfriend.

I just found out that she got pregnant on prom night which meant that she couldn't go to the college she had always wanted because of the baby.

I know she is responsible for what happened but I can't help but feel that if I had gone to prom with her she wouldn't have gotten pregnant.

Her boyfriend isn't the best guy in the world. But I think her family problems had something to do with her liking him.

There is a chance of me going pass Detroit(where she moved to) next summer, so I'm thinking of stopping by and talking to her then.