The whole car drive, crash, monster etc was all a metaphor.
The monster was the girls battle with life, her parents, her Mum's addiction etc.
She killed her Mother that night with the knife and what we watched was everything that went through her head as she killed her own Mother.
I enjoyed it, good acting, good B Grade monster effects and a good make up your own mind type of story.
I'm all for interpretations but that's like a rewrite of the movie. Sometimes a monster is just a monster, it's not really ambiguous. There is zero pointing to her killing her own mom.
shareI don't know that the titular monster was "just a monster."
It seemed quite likely that it was all an allegory. The monster may've been her mother's alcoholism/addiction which ultimately led to her death, and the little girl killing the monster and saying "goodbye" to her mother was her coming to grips with it, letting go.
Just a thought.
something terribly clever.