If only everyone did! But maybe Lindsay had a fake ID. Alonzo was quite a bit older than her, wasn't he? LDJ shouldn't have been there with him any more than our little MJD. He was (and probably still is!) a total predator.
I've been thinking....MJD's head injuries were in the back of her head, so I imagine her maybe leaning up against the door - facing the others in the car - and she fell out backwards. The door might have accidentally opened - I have actually seen that happen. But maybe someone (LDJ) reached over and pulled the handle - for whatever reason. If that is the case, we will probably never hear from her. I don't want to be negative here, but somehow, we have to make sure she understands we're just trying to ID MJD - not solve a possible crime......