Well I was too hasty about things. I'd say she was in there about an hour and a half. It was interesting though. Queenie wanted nothing but to join them. The Buckeyes were mainly afraid and hung back. I scattered some scratch near the divider - so that helped spread whatever could be spread no doubt. Butters, who is Defender of the Flock when it comes to the cat, got in front of everybody pecking and really kept an eye on Queenie, mirroring her moves.
It's tough because you want her to be happy. I'm sure they were curious of each other but hopefully nothing was exchanged. There has to be an infective dose. How long were they "together"?