That looks like cecal coccidiosis to me. The liquid dose is 2.5 ml per quart for 5 days, then 1/4 that for 7-14 days. Giving a couple of drops was a very good idea and exactly what I would have done.
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Her resting... is it standing up, eyes closed, puffed feathers, tucked neck? Is she laying? How has your weather been? How many birds in how much space? Just clues to say yes it's likely or not, no finger pointing.
Corid is the name brand of the medication to treat cocci, can usually be bought at feed stores. It works by blocking thiamine and starving out the cocci to slow their growth. They are in every single chicken poo and usually only an issue when bloomed out of control, sometimes aggravated by warm/humid conditions. Though not as common in older birds, very possible.
Treat the whole flock with the treatment dose not the prevention dose. And make sure to remove ALL other water sources. If it isn't cocci, it shouldn't hurt anything... though you will have to look up egg residuals to see if you need a withdrawal period. Do NOT supplement with vitamins during treatment.
Hope she feels better. [/QUOTE
She rests standing up eyes closed and she sometimes lays down she stopped laying a couple of weeks ago only have one bird and the weather is hot and humid