Another expiring chicken

I have another chicken kicking the bucket.  A few have died this winter, from the crew of clipped beaks that we got our first year, so they're all the same age, about 5 years old.  I'm glad, in a way, that they don't live forever, but on the other hand it's a little bit weird that they're dropping like they've hit an expiry date.  My favorite hen (ok, one of) is from this batch, so I'm not looking forward to losing her.  She's sweet.This hen showed lethargy for a couple days and then yesterday did not leave the coop.  In the morning she looked so nearly dead that I thought she'd be gone in minutes, but in the afternoon I got surprised.  She'd improved and was alert enough to look at me and accept some water. So she was only mostly dead.   She also found an egg to steal and sit on.  Very odd.And she's hung on overnight too, still with us.  She doesn't look good, but I've been wrong before.  I'm giving her vitamins and water, just in case it's not her time yet.