Only you can solve this chicken mystery!

[Sera]

Howdy Folks,

I've got a lethargic hen, she'll be two on Friday. Here's what's going on with her - I

1. Her comb and waddle are faded
2. She has been sitting for two days. Too tired to get into/ out of the coop/ roost at night.
3. She's missing tailfeathers, but her skin looks very healthy, no redness or swelling
4. Her poop is kind of green and runny, but no worms
5. Her breathing looked labored yesterday, but seemed pretty normal today
6. She's not eating or drinking (as far as I can tell)
7. The other hens are not bothering her at all
8. She's alert, eyes sparkly
9. When I put her in the coop tonight she pecked at me a little (thought maybe this was a good sign? I'm being optimistc

I treated her two days ago for worms, and yesterday for mites. How long will it take for these remedies to work? I was pretty sure she was going to be dead this morning, but she was alert and sparkly, but refused to eat or drink.

What am I missing here?