Everyone seems to love her...but I just don't trust her at all.
We don't even know much about her and the stuff we do know seems a bit off.
I refuse to take her sister story as absolute truth. I'm probably looking too deep into it, but the girl in the photo didn't even look 14. Molly could have taken that photo from anywhere. From what we've been told as Crawford, I find it strange that the photo was still there in perfect condition. There was that doctor stuff though...
I also found it strange how she just decided to hold onto the battery. I just found it so suspicious how she took off with it. For all we know she could have swapped it for a dead battery or something :\
I'm even more suspicious that when we got back to the house she just decided to leave, after helping the group through Crawford and being determined to get on the boat with us. (I know that she can get left behind in Crawford, but what happening to her is ambiguous). In my opinion, this just reinforces the point I made with the battery. Molly said she was a loner type of person AND the fact that she says things that show us she wants out of Savannah and that the boat is an open door for that...she wanted in. She could have just used the group to get the fuel and the battery and she'll go back to take the boat herself and kill anyone in her way, i wouldn't put it past her.
Heck, this is probably going to far, but what if she knows the walkie-talkie guy?
While I'm on the subject, I don't trust Vernon either.