From a Star is Born to Seabiscuit to Field of Dreams... I can think of hundreds of films where a character goes on to achieve public acclaim after an initial disappointment.

Not one of these films suggests that being rejected at an audition just once is a good reason to become a hypersexual serial killer.

That's what I mean by lack of exploration. Nothing Peral how's through warrants what she does. Not even close.

Now if you want to sell it as "just a horror film" like X thats fine, but selling it as a character study means you've got to be open to challenge on the character.