My girlfriend and I moved in together after only dating for a month. Now she is telling me she is freaked out

I feel like I've been duped. Now we have both signed a lease on an apartment and we have to live together. I feel like I'm in the right place, I love her and want to be with her forever. She is afraid of marraige and commitment because she grew up in a hard situation with her parents and she claims that she "doesn't do relationships." It would have been nice to know all this before moving in but now what can I do? Before we moved in together we were as happy as two people could be, now she's freaked out about it and I'm stressing myself over the fact that there's nothing I can do to help the situation.