Talking Zombie?

It was a horrifying but still unnecessary scene that the movie didn't follow up. If she can talk and reason (as she was trying to trick them with, "I'm looking for my daughter, have you seen her?"), then the others should be able to talk and reason too. And if all of them can talk and reason, then all of them can collaborate to logically infiltrate the warehouse. They may also be able to create their own societies or even reform their cannibalism through their reasoning faculty.

They should have cut this scene out entirely. The notion of a thinking zombie doesn't work.

This was one of the better scenes, in my opinion. I found it effectively creepy and it would have been even if the woman was not infected. The notion of a random stranger showing up and demanding to be let in, even if the stranger was not infected, would be enough to weird me out if I was placed in a similar situation as them.

The notion that she could talk or reason didn't bother me, either. Perhaps some individuals were mutated more severely than others? The infected man at the start knew enough to unlock the barn to get into Jim's quarters, so clearly these infected were never meant to be brainless savages even if some behaved like it. I actually kind of liked that about this film, and I wished that they had played around more with it.

Also random side note, but was there an indication in this film that the 'zombies' were cannibalistic in nature? I can't remember for certain, I just know that they attacked the uninfected but I don't recall them biting or having a taste for human flesh unless I'm forgetting something.

Everyone knows that zombies can't talk.