been through similar situation, but the girl was not that crazy. If I were in your situation, I would have just let it roll, and enjoyed the time, even though if you dont do it, she is gonna find someone else anyway..
One thing I dont get is how they believe we might marry them and bring them here to US. These married girls act like single these days and wants to get married with us, I dont know why do they believe that we would choose them when there are several unmarried girls in Nepal...