I don't think you add the spouse in the I140. You add dependents in I485 change of status. That you definitely should do, as otherwise, she will not change status with you and you have to file for her separately. Priority dates for family based green cards are somewhere in 2001!! Also, if you miss her in your I485, she needs to maintain status until her priority date comes out. If she starts the F1 now, it would be fine though. She needs to go and ask her international office what to do. But GO there, not over the phone.