When it goes into the psyche I would blame the relationship going astry on the husband. When the nanny enters the room the wife does look extremely depressed, and during the dinner the husband looked bored. Once the cat ran out with the head the husband made her go get it as though it was all her fault and her responsibility In that sense he is at the least verbally abusive. And in that time period, women didn't really get their say in things, they were controlled by their man. She was fed up and wanted more and obviously the mutant looking thingy had that and it swept her away with just a pleasant dance. Ya completely the husband's fault.
There are things that may be overlooked by some that brings out more detail in the story. If you're going for it again with a new story, try and make these little details stand out a bit more. Good work though!