Last week, in the 6 cage, one hen was eggbound, so we got out the hospital-cage, put her in the bathroom, steamed it up, and now she is perfectly back to normal.
A few days later, one of the girls in the 2 cage seemed to be eggbound too. We brought their cage up, did all the same... and she hasn't recovered, rather, she doesn't seem to be as bad as an eggbound hen, but seems generally malaised. It's been around 5 days now.
She's slightly fluffed, and sitting low, on her belly. However, this isn't constant, only at certain times in the day. Generally, she'll sit next to the millet, not keen to move. However, she makes it down to the floor, back up - she was on the top perch [of three in a metre-tall cage] earlier.
Because finch-keeping is no exact science, there have been a few false-positives. She was chattering with her beak earlier - I read online a sign of respiratory disease... but then her sister started too, they started general 'wouldn't having eggs be nice?' noises and they decided to play at making a nest.
I saw her defecate, green. A sign of illness... I then remember that I've put in mint and dandelion leaves to try and cheer her up. Nor was it wet.
I worry she may hay air-sac mites [from these two 'symptoms'], and then I read that spray from pet-shops is not to be trusted.
She doesn't seem well, but she doesn't seem ill, either. Down, but not consistently.

You can see the difference in sitting here between the two.

However, moments later you can see her sitting fine. Earlier I struggled to tell which was the 'ill' sister and which was the well one. You can also see from the picture the height she managed to fly - something the eggbound hen would never be able to achieve. She had to gauge it, but she still made it.
They are prolific egg layers, the first night they were up in the bathroom being steamed, between them they laid 3 eggs - could it be that she is just generally depleted?
I'm sure we can all agree that these little birds place a great deal of stress and anxiety on us with these little ailments!
Any thoughts?