There aren't any visible signs of worms to my eye with looking her over. Need to try again under the wings as she was resistant. And no, none of my three hens have ever been dewormed. I'll continue to look her over each day.
Basically she continues with an up-and-down course. Part of the day she will drink a lot of water, but then that may slow down in the afternoon/evening. At times she has no interest even in treats, but this morning when I got her out for a walk she actually poked around with her beak and I saw her get a small grub. Then she ate quite a few mealworms. She continues with mostly yellow water for poop, but in the last day it has also had a little dark poop in it, too, more what I would consider normal.
Thanks for your comments, I appreciate it.
If you're experiencing extreme heat where you're located, the birds could be suffering from heat exhaustion too. Worms, however, can magnify their symptoms and vice versa.
Are they getting any electrolytes and/or vitamins? Electrolytes in their water will help them cope with the heat, and even taking them inside for an hour or so of A/C helps a lot! Don't rule out worms either. Worms can sap the strength of even the healthiest bird in short order.
If they were my birds, I'd start with vitamins and electrolytes using a product like this:
https://www.tractorsupply.com/tsc/p...-vitamins-and-electrolytes-with-lactobacillus
or this:
https://www.amazon.com/dp/B01MS3QY8O?tag=10bestreviewz-20
If they didn't respond to that in about 12-24 hours, I'd start them on Safeguard de-wormer (below), AND watch their stools for blood in the stool, not because of the Safeguard, but you're looking for signs of Coccidiosis.
Safeguard (Fenbendazole) 10% suspension liquid goat de-wormer can be found here, and I'd recommend keeping it on-hand all the time; we do.
Tractor Supply is a good source for this too):
https://www.tractorsupply.com/tsc/search/safeguard goats?
If you'd like to be prepared to treat Coccidiosis, purchase some Corid which can be found here:
https://www.tractorsupply.com/tsc/brand/CORID?
It's often difficult to determine exactly what is wrong with a bird because they hide illness so well, so we must sometimes treat based on some intuition. Heat, illness, and worms seem to be some of the most troubling conditions birds face followed closely by predators and malnutrition.
Good luck, and let us know how you proceed. Dosing instructions for Safeguard can be found here (refer to posts #2 and #9 in the thread):
https://www.backyardchickens.com/threads/safeguard-dosage.1437427/