With AI I feel not just one would be ill at once. I am thinking along the lines you have, either a cardiovascular issue, or bacterial, though I have not seen bacterial issues act that fast.Remember Glynda passed away from likely congestive heart failure.
Fluid can be in the lungs for reasons other than infection. If the ammonia content is real high it can cause damage to the lung tissue which results in fluid in the lungs as well.
I agree with closing off the coop until you can get proper ventilation.
If it's AI, you have to pray it doesn't take them all. There is nothing you can do to stop it.
I worry about it every time something respiratory comes along.
Likely the wee lass had some unknown health issue - our chooks are just like us, they can be born with issues we don’t know about.
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