Dude, you have to get righteously pissed, right now. She is trying to get at you. Sever all ties immediately. Get rid of the white Bonnie, let her go junkyarding if she needs parts. Get rid of that crap in the garage, give her a week to pick it up, then donate it to charity and take the tax deduction(if Canada works that way). Get your money. File in small claims tomorrow, don't worry about appeals, small claims cases should be limited as to how far they can be appealed.
Refinance the car, it'll be a nice little slap in her face, and you might get a better rate, god knows.
If she calls you, immediately ask if the call has to do with getting her stuff out or getting you your money. If it doesn't, hang up, don't say goodbye, don't say anything else, just put the phone on the receiver. It'll send her up the WALL.
Call the cops if she shows up at your place in a vehicle incapable of moving at least one piece of furniture out of your garage.
Restraing orders are fun, too.
Be vicious, but do it carefully. Make sure that she can't get a purchase on you. Don't let her have that little crack to pry at. DO NOT LET HER INTO YOUR LIFE. This thing with the car proved she wants to hurt you. Don't give her any opportunity.
One tip, DO NOT threaten to sue if she doesn't pay up. Believe it or not, telling someone you will sue them if they don't do what you want meets the legal definition of extortion. You can sue them, yes, but you can't say "If you don't do blank, I'll sue."
Straight from an ACLU lawyer, that little tidbit.