In a freezer... Probably killed her, or she OD’d... And he wasn’t smart enough to figure what to do with her body... Pig farms are great places for body disposal... You just need a friend with a a pig farm. A dumb idea is placing her body in your Tesla, and then reporting it as stolen.
Yes, perhaps stashed in a freezer. Or perhaps she was alive for much of the time she was missing.
The length of time from being reported missing and the discovery of the body in a car trunk is not dispositive.
If she’s been on ice for 18 months, that will be quite obvious in the post-mortem.
I don’t she’s been dead for very long. I do wonder is she’s the one that stole the car, though and been hanging out with low-lives that eventually killed her and stuffed her into her own stolen car.
And what about the Tesla cameras?