J.C.
The best you can do is make the schedule and go over it with her before you go. If you feel she may not take well to you giving it to her, tell your husband beforehand and have him tell her with you or just have him go through it with her. Once you are gone it is out of your hands, and you should just try to enjoy your trip. If you want to check in with her, it is probably best to have your husband call her and discuss it since it is his mother and he should be able to handle it with his own mom. If she likes total power and control like you say, then you can just do your best beforehand with your plan and have hubby check up on how she is doing with it once you are away. All in all, I would not worry about it too much since there is not much you can do once you hand her the reins.