cmon...get her a 14 days air ticket return (or maybe open flight for return)then if u extend her visa that's the time u will rebook her ticket to change the date..because its depends how strict ur immigration law in ur country...for common sense, u cannot show a ticket with days more than her visa, even if u will renew it or not..its better if its until her visa tenure expiration or shorter....YOU GET WHAT I MEAN?? lol doesnt help.trying to help/advise u man....