I really don't know what the withdrawal period would be for the medication you have been giving her. If the meds came from a vet, it would be best to ask the recommended timeline on that.
Avian Influenza (AI)- she would be having symptoms of respiratory illness - coughing, sneezing, facial swelling, spotted comb and legs, lethargy and not eating/drinking.
Avian Influenza (AI)- she would be having symptoms of respiratory illness - coughing, sneezing, facial swelling, spotted comb and legs, lethargy and not eating/drinking.

but you gave her a good life and really could not have done more. She was doomed to a short life by her breeding, but it is quality of that life that counts and it sounds like you loved her and looked after her well for the time she had. No chicken can hope for better than that.