OP, I am so sorry to hear you are going through this.
I once had an lady from India who was a "sitter" but she was also Muslim. Well, guess what, I go into the patient's room and she was on her prayer rug praying and continued and did not even stop when I came in, even though she was suppose to be watching the patient. If that patient had gotten out of bed and fell I wonder what she would have done and what would have been her excuse.
I was not against her praying, but at least she could have told me at the beginning of the shift she would be preforming her prayer ritual, she was working 12 hours from 7am-7pm so she had to pray 5 times a day. I never reported her or said anything to her about her job duties. I know if some other nurses had encountered this they would have gotten the charge nurse to call her agency and terminate her.