Do not take the risk of exiting and re-entering. You will be stopped at the airport and will face problem.
Actually it is written on the visa in arabic "safar wahid" i.e one time entry/exit . Plus the guys at immigration are not at all friendly ..your problem wii not be solved. it better she stays the full 6 months here and leave at the end.
But i heard that for Umra visit to Saudi Arabia only she can come back for balance months (if yu are all
are muslim).
Please confirm from immigration though...do nit depend on Company " Mandoob".