What a mess......I feel for you and your Mom, but do stay safe. Sometimes I am amazed at what the law enforcement people will NOT do and the lame reasons why not. There seems to be a huge difference in departments, even adjoining districts.
Tell ya' what though.............Is the tow guy really a repo specialist? If so, I'd pay him and hope like hell the sleazy dude who has the car tries to stop him. A Repo Man with a legal document will pick up a car at all costs and woe be to the idiot that gets in the way. The guys in that business just love to fuck people up and have no problem putting them in the hospital. Hey.....the repo guys are just defending themselves, right? Damn straight right!!! Its the next best thing to hiring a hit man.
Good Luck, Stay Safe, and I'll be holding good thoughts for you.