What you actually do is up to you, of course.

As for me, I wouldn't want someone like that in my life, even if they are my mother. I would already have sent a certified letter to her saying "You have 10 days to return my property. After that I will call the police and turn the matter over to them."

If I didn't have my property back after 10 days, I would call the police, just like my letter said.