Searching for a movie

The movie is about a woman moving to a house with her husband next to an old woman (neighbor) in the movie the woman is hallucinating the whole plot while her husband is dead on the bed and the neighbor did never exist
(in a scene the woman bakes a pie and let it outside the neighbor's door while hallucinating that the neighbor took the pie, but never did), I saw a video clip at facebook and no one know the movie name I don't know how to ask so What I saw in that Clip I described here.