She's a 4 month old olive egger, came from a hobby farm, not a commercial hatchery. Noticed she was staggering around like she's drunk. Couple days later her eye got goopy. Quarantined her, gave her 1ml Tylan 50 orally once daily for 5 days. Also used VetRx on her beak and under her wings and have been spraying the goopy eye with Vetericyn several times daily. Fifth day of Tylan was Tuesday, February 14; I read not to give for more than 5 days. She's eating well, drinking well, no sneezing/wheezing/coughing...but still off balance and eye so goopy its sealed shut. She's been quarantined a week, none of my other chickens are showing any symptoms at all. Any suggestions?? I named her Otis.