I'm going to pick up my girlfriend from behind and put her in the car after she wouldn't leave the party
What is your reason for wanting to force your girlfriend to leave?
The partying is over and I'm tired of waiting
You shouldn't force your girlfriend to do anything, especially physically. She may accuse you of sexual harassment and your social status will plummet.
I don't care.
Be careful not to do things that you may regret at a later time. All I can do is try to give you the best advice that I can, however I can not turn back time and neither can you.