Need advice to punish a thief

A friend of mine is an older gentleman that has mental issues and after his wife passed away, a young woman was hired to assist him with his every day Life needs. He has had a stroke and is unable to live without assistance. Family and friends are few and live far away.
I personally witnessed the young woman and her husband attempting to convince the gentleman to change his will and make them beneficiary for his house. I reported it to his daughter who ensures his will and POA were secured in a safe deposit box.
The young woman was fired but continues to contact him and mess with his mind making it difficult for the help who was hired to replace her.
He is infactuated with the young woman because she flirts with him and leads him on. He is 85 she is 39. All she want is his house and seeing that she has already taken silver and gold from him, and padded the log books for when she was there, she is a thief.
When she was there, she barely did anything for him, he was always dirty, had no clean clothes, dirty house, no baths and she never fed him anything good for his health. Diabetes type 1

I need help getting rid of her by flooding her mailbox or phone since he won't file a restraining order and this woman won't stay away.