I saw this movie 2-3 yrs back but it's not older than 2000 for sure. The movie scene and quality was really good, the grotesqueness of that scene was comparable to those scenes of the Serbian film. I only remember the video of it playing in my mind, it may or may not be English.
The only pieces of it that I remember were the kind of last(?) scenes of it in which a fully grown girl (or woman) was coming out of the vagina of this woman. As if she was trapped inside of her, and feeding and eating her bones (bone-cracking scenes were there too, I recall).
The body of this outer woman was being deformed as if was a pile of skin falling to the ground. And then the new girl went on to live the routine of the older woman, as if she knew what everything was; and even went on to later have sex with her husband. She hid the pile of skin and lived as if nothing had happened.