Ok. So. Let me preface this by saying Esme is 100% fine and normal now.
A couple evenings ago 3 girls came back to the run around 7ish, their normal time. Esme was nowhere to be seen though. I called around for her and shook some treats, nothing. Finally after 20 or so minutes I saw her slowly walking around in the woods, so I went to grab her. As I got closer I noticed she was walking a little funny (almost pigeon footed), seemed weak on her feet, kept stumbling and putting a wing out to steady herself. I went to pick her up and she freaked out a little, but once I had her she was kind of despondent.
I brought her up to the run where she promptly went for the food. Her tail was down, she was unsteady and stumbling as she pecked around but managed to eat as much as she wanted to. Gytha was picking on her though so I took her back out of the run to see her walk around. When I tell you I was so worried... I should have gotten video but it didn't even cross my mind! She almost seemed drunk.
After a few minutes of watching her, I gave her some treats which she eagerly wolfed down and put her straight into the coop. I doubted she'd be able to get in by herself, that's how uncoordinated she was acting.
The next morning I braced myself for the worst, but she was acting 100% back to normal. Only difference was she was still inside the run with the rest of them instead of escaping.
Which brings me to my question: what the heck could have happened? Could she have run/flew into something and stunned herself? Got into some fermented fruit? Jumped by a predator and escaped (no injuries though)?