invite her over for a month or so, send her affidavit of financial support, an invitation letter and tell her to apply for tourist visa. she needs to show strong connection with nepal assuring that she will return. once she is here, she is all yours! send her to mexico or canada before every i-94 expiry for vacation and reenter. or may be she would like to join some school. if yes, at the port of entry, she should declare the officials that she intends to join school, if she finds appropriate one. you may as well send her a list of schools. this way her b-1 to f-1 change of status would be far too easy.