It's obvious that the girl is trying to screw you over, so screw her over. Call the cops and say she must have stole your keys at the party, and took your car.
It's your word against hers. Only she is driving your car, which makes it grand theft auto. A felony. Put that bitch in jail.
Also, you'll be able to sue her in civil court for "damages" done to you (missed work), the car, and of course punative damages (hopefully).
These suggestions about bringing a gun, etc. will only make things worse. I promise.
And PS: I'm not sure what type of people you're hanging out with, but it doesn't sound like you're hanging out with the "good" crowd. Just sayin'
yah man I am cutting off the entire crowd I roll with , I just got back from the police station and its the same BS its a new Law here in freaking MN that if you know somone its illegal use of an auto, not theft for 30 days.
The situation has taken a new twist , now somone is finally answering her phone (by text only) he says he has my car in his garage and he took it from her since she owes him $1700 WTH !!
he wants to trade me her location for my car and the cops STILL won't do anything.