If Allah is with her, then marry her. For Allah is with those who are hunble and patient and shows endurance at times of testing periods; darkness will not shroud their faces; they are always peaceful, smiling and pleasant looking; and they are free from pride and prejudice; they shall not engage in arguments over what is truth; and they would fulfil their obligations whenever they make a promise. But for Allah's help and nearness such guided pleasantness is impossible. You do not have to ask your date on her beliefs. Well you know well by now, whether she is with Allah or Allah is with her or not. Go ahead and marry then.