Your update is welcome but discouraging. The only other thing I would recommend is to increase the metronidazole to a quarter tab twice a day.
I wish I could be more hopeful, but after trying several different medications and I see no improvement or even a reverse, I assume a greater underlying condition such as an avian virus that is producing tumors. If that's the case, the tumors would inhibit the immune system, and the medications would do little good.
@Wyorp Rock 's suggestion to get a test for parasites is a good one, and at least you can rule it out as a cause. If it turns out she has a load in her intestines, it opens up the possibility of a med that may turn this around in the hen's favor.
I wish I could be more hopeful, but after trying several different medications and I see no improvement or even a reverse, I assume a greater underlying condition such as an avian virus that is producing tumors. If that's the case, the tumors would inhibit the immune system, and the medications would do little good.
@Wyorp Rock 's suggestion to get a test for parasites is a good one, and at least you can rule it out as a cause. If it turns out she has a load in her intestines, it opens up the possibility of a med that may turn this around in the hen's favor.