[y4mi]

its quite easy to imagine in my opinion.

she drives home and gets these notifications, which clearly spook her, which is why she made extra turns etc.

she sends a few messages to friends and/or family, because she's freaking out about it, but goes to sleep because she doesn't know what to do

one of these friends or family comes by in the morning, sees her car and checks it out before ringing her door bell

the given facts are quite believeable, though i doubt there is a human trafficing relation which she seems to think. its more likely a potential stalker, upset boyfriend or similar.

[luckylion]

What friend would check the car, find a tracker and then immediately get rid of it and not even take pictures of it instead of showing her or just calling the police themselves though?

What's somewhat plausible is that "the person close to her" put the tag there in the first place. They'd have a good reason to "get rid of it" in that case.

[daenz]

That's believable, but it contradicts "this morning while I was asleep I had someone". Her asking someone to search her car before she went to sleep to "figure it out in the morning" is more believable.