You have had some terrible experience with disease in your flock - unusually bad, it seems to me.
Like @Kiki, I agree your bird likely has an infection and should be treated if you plan to try to save her. I also think its HIGHLY unlikely that infection is PT - but given your experiences with poultry diseases thus far, I can understand your concerns.
Gladdened to read you are following a quarantine practice - if you don't mind the intrusion, do your neighbors have sick birds all around you? I find it difficult to imagine having so many poultry illnesses in a short period of time if one isn't actively swapping birds with other flocks, and maintains good quarantine when obtaining new birds - unless the surrounding area is diseased, and your birds are being infected by the "locals", whether mosquito-born, wild bird species, etc...
Like @Kiki, I agree your bird likely has an infection and should be treated if you plan to try to save her. I also think its HIGHLY unlikely that infection is PT - but given your experiences with poultry diseases thus far, I can understand your concerns.
Gladdened to read you are following a quarantine practice - if you don't mind the intrusion, do your neighbors have sick birds all around you? I find it difficult to imagine having so many poultry illnesses in a short period of time if one isn't actively swapping birds with other flocks, and maintains good quarantine when obtaining new birds - unless the surrounding area is diseased, and your birds are being infected by the "locals", whether mosquito-born, wild bird species, etc...