Our 3-yr-old Australorp, Mother, didn't seem to be feeling well for a couple of days. She laid down yesterday morning when the rest of the girls were scratching around, so I separated her and found pea green solid & bright green liquid droppings in her hutch. She is eating & drinking. I started her on sulfamethoxazole/trimethoprim. She molted in late spring just before becoming egg bound. I don't know if or when she has laid an egg since then. About 2 weeks ago, her feathers had finally all grown back in. All the girls were wormed with Valbazen in late summer (they are wormed 2x/yr). They had lice mid-fall & were treated with ivermectin. At least one of them had green & yellow mucous droppings a few weeks ago and all were given metronidazole because I couldn't tell which 2 or more had the problem. They alternate between apple cider vinegar, probiotics, and plain water (plain water is also always available). They eat Purina Layena pellets with grit & oyster shell always available. They have a handful of Scratch & Peck Feed's grubs & 3-grain scratch once a day. Ideas? Edited to add more details.