That's the dichotomy of it and that's the beauty. That's great writing right there because you want to feel sorry for her as a mother, the desire to see her kids but her ex sees her for what she is - an incontrollable monster
As a society, we're taught to abhor anyone who tries to take someone's kids away from them, to prevent them from seeing their children. So the scene in the beginning where the father but not let the mother near her children garners sympathy for her and hatred towards him...
But when you see the final scene, you see that he was right. That she had no reason or right to be around those kids
That shit was brilliant
Very interesting take, they pulled a lot of the vampire lore. Not being able to enter a home without permission was a deep cut (no pun intended)
She had more right than that father, the "stubborn" one that ratted her out what was the first thing she did when she saw that blood? Now she is the easy going child! Those kids need someone who can help with that hunger. They're on the playground and some kid gets a bloody nose or they get to middle school and a classmate gets on her period. These are scenarios that, that father is not equipped to handle. It's like mixed children there is always a parent that has no idea how to care for a child's physical needs. Hell white folks JUST learning about cocoa butter!
But to your point she is a monster for turning that child at such a young age. He technically stays that age forever now!