Although the location is Washington State, USA, when Blair meets her lawyer in the park, the door of the yellow taxi she exits includes advertising for 'trips to USA'. Thus revealing the film was shot in Canada (BC) and not within the continental US.
The movie was made in May 2019. But the headstone for the daughter says she died in Aug 2019.
Although "documentary proof" was given of Lori's "demise", no one thought to make sure by looking at newspaper or television news items on the crash, which would have told what happened - and what didn't.