3-yr-old hen lethargic, twitching neck, regurgitated clear liquid, has runny poops

[prairiepearls]

History:
December 2012: My two 3-year-old hens stopped laying. Did fine all winter & spring, but no eggs.
Mar. 15, 2013: Got 3 new baby chicks from Orscheln's. Kept indoors & separate from 3yo's until end of May. Two were roosters, so only kept one of these -- she's now 3 months old.
May 27: Found one 3yo dead in coop, bright red & messy around vent.
June 3: Got three 6-wk-old pullets from an experienced local poultry raiser & shower. They are sleeping separately from the 3yo & 3-month-old, but ranging in the yard with them during the day. Seem very healthy & active.
Yesterday (June 12): Noticed my remaining 3yo was rather lethargic.
Today (June 13): 3 yo still lethargic & noticed she's occasionally twitching her neck. When I turned her over to look at her vent area, she regurgitated some clear liquid. Her crop feels soft. Her poops are quite liquid. Other than that, she looks completely normal. I brought her in the house because it's suddenly gotten quite hot here (Kansas) the last couple days (after a long cool spring). She's just standing & dozing next to me. All 4 of the younger pullets are active & seem healthy.

Any idea what could be wrong with my 3yo? Or what I could do for her?

Thanks in advance!
Greta

 

[Faso]

The twitching neck thing with the mouth open sometimes is gapeworm. I'm no pro but I looked into this recently so I thought I would at least give you something to look into. Best of luck.

Faso

 

[prairiepearls]

I've done some more reading and thought she might have sour crop, even though she didn't smell bad. So I took her out in the yard just now and turned her upside down and massaged her crop and lots of liquid and some lumps came out, and it did smell a little bad. So I'm going to try some olive oil.

Also, thank you, Faso, for the suggestion to look into the possibility of gapeworm. I'll do some more research.