Since she is a student and does not want to miss her class or have any interference with her F1 status, after the interview, does she have to stay at her home country for a while? As far as I know, after the interview, it can take a month or so to get some response then probably another month to come to USA as an immigrant. That's why I wonder if she has to go for the interview but stay for a while (that would mean she could miss her classes for a month or so) and the university would need reasonable justification to allow that since she is here as an International student.