I'm not so distrustful of Enid yet, but it wouldn't surprise me if she was the one that took the gun out of the blender though just because she didn't know Rick. We know she likes to take secret trips outside the wall. And she's obviously decent at staying hidden. My guess is she was over the fence when they arrived, saw Rick drop the gun into the blender, and picked it up. She came from "the outside" too so she probably isn't completely trusting of Rick's group yet knowing the people that are out there. Like Rick told Deanna in their interview,"people out there measure you by what they can take."
I did laugh pretty good seeing Daryl carrying his possum by the tail during his interview. They're doing a good job of hitting the contrasts between Rick's group and the people of Alexandria.