There's a complaint I heard about this that I feel like adressing.
Spoiler...
In the American film, they changed it to where when Abbie fed, she did a slight transformation where her eyes demon like and her teeth where more sharper I think. This is an obvious change and some havn't liked it compared to Eli who even while she feeds remains calm and dosn't transform in anyway. I can see why they complain cause that did help keep her child innocence present. Also, Abbie can roar and has a more adult and evil soundind voice when she's angry/hungry, something Eli never had. However, I think Abbie and her more feirce form works in this version. The reason why is that most of the movie she only makes this version come forth when she's in desperate need of blood, pretty much not feeding brings out the demon, hence why she sends the old man out to kill and collect blood. To be honst, it makes sense. Also, it's not like Eli wasn't any less of a monster, she still sent someone out to kill for her and she did it herself when she had to, she just didn't look nearly as evil when she did it.