As she is on a student permit, it is the normal conditions of the permit that students agree to leave the country after their studies are complete. This is a standard clause in the student permits for cantons around here. She probably already signed something to this effect when getting the original permit. If graduating from a Swiss university and non-EU you have thé opportunity to find a job for some months after completing the degree but need to go through the non-EU hiring process. If citizenship is a goal I don't think student permits count without time on a normal job permit thereafter. So you should really have a plan b for when her studies/permit finish.