Can she ask for a change of status and just stay and wait for the Graduation? A lot of the Brazilian APs ask for a change of status to a visitor visa and they can stay until they ear back from the DoS. So they fill the form, pay the fees and wait for it to be processed. Sometimes It take a while but after they receive the letter acknowledging that the Dos Received their request they can stay legally until they hear back (At least that is what I was told). FYI I know they all do that not sure if that is the correct way to do it, just giving you some ideas
