Don't beat her down with it, because that won't help. Try to appreciate what she IS doing for you and accept this for now. Eventually, after she is more comfortable about the stability of the relationship, she will probably tell you. Right now, she is probably afraid that if she tells you, she will lose you.
What is it that you want to know and how will it help you and your R?
One of the pros probably needs to weigh in here, but those are my "amatuer" thoughts.
