Doesn't make sense to me on a lot of levels. He obviously did NOT take her back to the apartment, but instead immediately headed elsewhere. So if she got in the car with him willingly, she knew in a minute he wasn't going where she intended. And she needed her keys, if she didn't have them, so it's not likely a change in plans she would have agreed to.
But that means a crisis/ conflict there. Yet at that point you still have her traveling with him as a passenger, then being put in trunk at some point later, so that means another conflict/crisis moment later.
I think it much more likely that we only have one incident, somewhat extended stuff, that includes a struggle, bite, wreck, and her getting put in the trunk. The info we have points away* from it happening early in the 3:58 to 5:32 time span, unless it happened in the garage at the outset.
* The Camaro left the garage and in 10 minutes was traveling to the NE at the Custer gantry, which takes 9-10 minutes to get to via the best route.