Narcissistic mother
I have two parents with Narcissistic Personality Disorder (NPD). I realized when I watched this movie that the mother was very much like my own, but I didn't make the connection until eight years later, when reading about clinical narcissism (as opposed to the everyday "it's all about meeee" variety) and it mentioned the mother in this film is a narcissist. If I'd have found out sooner about NPD, I could've been saved a lot of suffering. Posting this for those who come here thinking their moms are like this mom, too. There are lots of resources out there.
See if this essay resonates: http://parrishmiller.com/narcissists.html