Sick hen? Impacted crop and confused?

Try drip feeding her some diluted Epsom salts via a syringe, that gets things moving in hens too!  Also a bath in the stuff can work wonders for a hen that's feeling under the weather.  Worst case is that she is nearly the end, hope not though, as it is so sad to lose them.

I gave her about 2ml of diluted Epsom salts of the 6ml I had prepared, she decided she did not like that and would rather get better, did a huge poop ate about 10 maggots and about an hour after that her crop was nearly empty! I'm going to give her some pellets in the morning and pop her back outside with her friends.
On a side note, looked through my partners records (he likes to keep note of the chooks: breed, when we got them, or their hatchday etc) and she's only 2 1/2 to 3 years old, but thank you for the link anyway, we've certainly lost birds from our flock so I do understand they're very delicate little creatures but Sigourney lives another day

Great news! My hen only had a small dose of Epsom salts, and then ran around the garden like 'new' again.  Keep an eye on her though - sure you will.

might be useful to check poop for what caused the impacted crop. Is there enough grit available as the ground is more wet, or mown grass left or hay available for other pets.