If u leave ur wife on f1 status then she wouldnt be able to come back to the country without sevis. So u need to change ur wife's status to h4 visa, which is dependent of h1 visa and both of u will have to get stamped for h1, h4 visa here or in nepal, whichever u choose. If u dont want to put ur wife as ur dependent then she will have to extend her I 20, extend as in extend her semester.