What can I do to ensure my child''s safety while she is with her dad for his court ordered Visitation?

I am the sole managing conservator, he is possessor, we do not have joint Custody, He only gets her his "allotted" time, although I am willing to let her see him more, I cannot trust where he will be with her or leave her. He will not tell me where they are and has left her with his medically proven crazy mother to stay the night. He moved out of her house because of her and my daughter since hes moved out, has been fine When shes been with his mother, she comes home and hates me and is absolutely a terror. She''ll hit me and tells me she hates me, not pleasant at all. And shes only 5, What can I do to keep him from doing that? His mother has had no relevance to her life since shes been born by her own choice.and shes a narcissistic psychopath. but he only sees our daughter 4 days out of a month by his own choice. i feel like he shouldnt be leaving her with anyone during that time and if he needs a babysitter or leaves her and she is not in his possession i should be notified