If she's underage then she has few options. You can not give consent for the procedure.
Where do you live? We can help you with options.
Christian, do not be afraid. I know that you and your girlfriend are young and are very worried about this, but don't go thru with an abortion. Odds are if you do, then your girlfriend could develop some serious mental and physical complications;
My advice is that you seek out your local crisis pregnancy center for help or give your child up for adoption so that another family can have the ability to love it in your place.
All in all, don't worry and if you need anything else, feel free to ask