why don't you get a hidden camera and then you can see whether she steals or bring in people. Even telling her you have one (when you don't) might be enough to deter her. ANYTHING is better than treating someone like a slave.

And yes, the Qatar labor law states that ALL must have a day off. Unfortunately it is not enforced. Do what your conscience says. If it says that it's ok for you to work someone 24/7 then there is no hope for you.