She sounds evil to keep your daughters away. I am thinking of you. I can't imagine anything more painful than this situation.
I will admit to you that my H can be very resolute about doing things "his way" and there have been times when I have been paranoid about his motives due to my mental condition. When I would get paranoid that he wouldn't agree, I would hide things from him (like buying groceries for our children). Medications and going to a T has helped me with this. I don't know if your spouse has a mental issue but am just trying to give you a real example showing how marriages can get so messed up.
I really am sorry you are not seeing your kids. This is so messed up.