No post is too long :)
from what I have heard on this forum, your girlfriend's reaction seems a little odd... Many women who come on here with feelings of guilt after their abortions want to have children as soon as possible. However I have no idea if that is the norm for women who feel post-abortion guilt or not.
It does sound like your girlfriend needs someone to talk to her and explain that just because she had an abortion, she is not a bad person. She needs someone to explain her feelings to, and she needs that person to explain back to her that every child that she gives birth to is a gift. She will love that child because it is hers, and she wants it. She may not be ready for children at this time; but if and when she is ready, that child will be the most wonderful little package in her life.
That person would be, you, at least! If you think she needs more help, you can always go to counseling together, or she can seek help alone. It does sound like she is not ready for children in the near future, and that she needs a psychiatrist's help in order to ever be ready. It sounds like you love her and care for her.
On a personal note, if you two are at the point in your lives where you are considering having children, I hope you get married before you do. I'm just old-fashioned like that; and I see no reason why you couldn't, at that point. You might not be there now!! But someday you may be.