I got a chicken from auction. I realize now this was probably a mistake. She was quarantined 9 days before she went from fine to sick. Rattled/congested breathing. No foamy eye, no facial swelling. She’s still active and eating and drinking fine. I went and got Tylan after reading through the forums and started treating her. She has improved but still not 100%. She doesn’t sound rattled/congested like she did but is still doing some open mouthed breathing. My question is, should I cull her? I just have a small flock. They are pets. I’m fairly new to raising birds and while I’ve lost a few, I’ve never had a sick one and never had to cull. Is there a chance she recovers and isn’t a lifelong carrier of something that will infect my entire flock? I don’t know what to do!