Agree, it seems a very unlikely coincidence. If we land on it not being a coincidence, LE should be looking at the people who knew or who she told her car would be in the shop that day/night. I'm not sure who all would be on the list, but since her landline activity was supposedly limited in the period before she went missing and she didn't use email, it can't be a long list.
Then again, a neighbor could have seen that the car was not in the driveway, but from the drone photos of the area, there's a very limited number of neighbors who could even have seen her driveway and there would have been no one just driving by as her street deadends immediately after her house.
Why can't LE puzzle this one out??