The End Discussion (spoiler)
I would like to discuss the end. So if you don't want spoilers do not read this post.
In the end the new fiance discusses Nancy's future with her ex the psychiatrist, who tells him that there may be a future for her if he can love her enough to stick with her. His mother, who evidently was the woman who had accused Nancy as a child, discouraged him from going with her to the hospital saying there was nothing to be done with her. But in the end he did go with her- we see him going out the door at the very end. Was this what I thought it was- that the fiance still went with her to show that he was still going to stick with Nancy and that she was even able to capture this husband despite even her mental breakdown and him knowing the truth about her? And that this was the mother's comeuppance for her mean behavior, to have her son go with Nancy- this deranged woman?