Darlie knew all about plastic surgery. Shoot you don't think she wasn't smart enough to know that after the coppers leave her alone and go after the "so called real" intruder that her surgeon would of recommended plastic surgery to fix that ugly scar right up.
As for the carpets, did you know that the very 1st time Darlie went back to the house with one of her closest friends, the very 1st comment out of her mouth was that she was going to have to tear up the carpet because it was ruined. Hmmmmmmmm. Sounds like a devasated mother to me. Her friend even confronted her about her lack of empathy and guess what...Darlie looked at her and said those people wrecked my HOUSE. Look at all the work that I am going to have to have done.......
NOW, I would NEVER EVER EVER EVER want to step another foot inside the house that my precious babies were brutally murdered and I was brutally attacked in.. NEVER!!!!!!! Now I know there are some people that would but I do not see them obessing over the carpet and drapes.
She changed her stories to match the evidence. All the way to the sock and knife, she planned this. Why, maybe because of Darin. Maybe because she didn't want to be tied down to 3 kids.