I used to be a lot more pro-choice than I am now (34), but I saw a lot of things in my college years and more than a few girls in our sorority made the same decision. I thought back then that you do the best with what you have at the time. But I look back and shake my head now, as I'm sure a few other gals, at our acceptance of abortion as "OK" because we were trying to make something of ourselves academically, etc.
Remember folks, that a single girl's confidence to accept her unplanned pregnancy, look a critical world in the eye and have it despite easily obtained options comes from a terrific, loving upbringing by strong parents. I agree with the above recommendations to take away her support.
That said, if this has indeed happened, remember to keep loving this girl as she will need your help. This will be painful for years....
My prayers for your family--