It should be illegal for employers to request employees install anything on their personally owned devices or to retaliate against employees if they don't. Her

It should be illegal for employers to request employees install anything on their personally owned devices or to retaliate against employees if they don't. Her employer could pay for another phone that she keeps at the school to use as a timecard/geofence - but I'd imagine a shitty employer that wants to implement this sort of system is only willing because they can mandate free use of employee property they do not own.