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I would do nothing, wait. She has had a laundry list of treatment and it may be the problem. Wasn't terramycin used also? Stop giving her meds and wait. Every animal has what is called "natural flora" which are micro organisms which we depend on to live. For animals there are natural bacteria in their gut that help break down food and digest it properly. Bacteria everywhere on the bird really, but they are beneficial bacteria and not "opportunistic" or pathogenic bacteria. Bacteria generally fall into two classes, gram positive and gram negative. We won't break it down more here as far as to morphology (rods, cocci etc) or the post will be too long. When the immune system gets messed up this can adversely harm the animal. With the list of meds used, I suspect that this has happened. Usually I use antibiotics for 3-4 days and one at a time orally or through injection. Each antibiotic has a target bacteria i.e. gram negative. When more than one med is given in close proximity time wise and each one wipes out a different class of bacteria there is a potential to have problems because the meds are not specific to pathogenic bacteria and wipe out the good stuff too. Have you felt her to see if she is egg bound? If you give any more meds, no antibiotics maybe just ivormec in case it is a resistant worm, but check for egg bound first. Yes move out the chickens too.
Best of luck
