So you know exactly where I am coming from in urging you to quarantine! It is truly horrifying to have a sick flock. Southerbelle just got done having to cull her entire flock because of MG.
I'm truly hoping that this was just a fluke for your hen, but it certainly does make one scratch their head. Foamy eyes don't usually just pop up for nothing. With your college background, I know I don't need to preach that one to you!
As far as the migrating birds go, you don't put out any feeders or bird baths for them do you? I'd get rid of anything outside of the coop that would bring them down into your yard if you have anything out for them.

As far as the migrating birds go, you don't put out any feeders or bird baths for them do you? I'd get rid of anything outside of the coop that would bring them down into your yard if you have anything out for them.