How is this little bit of my novel?

You change tenses without good reason, starting with present "is not as normal as she seems" and then going inexplicably into past "she was a serial heartbreaker". That's quite jarring to read. There already is a bar mitzvah for teenage girls - the bat mitzvah. It's quinceanera, not Quincenyera. Definitely tidy up your punctuation and grammar. The bit about the food chain is good. "Too busy" not "to busy". I'm not sure who we are supposed to like in the story, which makes it a bit difficult. If something is going to happen to Lacey I think I'd want to make her human character a bit easier to warm too. It might be better to show her insecurity rather than tell us she has it. It is intriguing, though, and I'm sure people will want to read on and find out what happens to her.