Had to put one of my older hens down today...

I noticed yesterday that she was really 'off' and when I checked her this morning she was clearly worse. What with all the surprise additions lately, and the horrible cold, I didn't have anywhere to put her to try to treat her.
She didn't struggle in the least when I picked her up (but she did give me a 'parting gift'; needed to change my pants), which also told me she was in bad shape. She had weird yellow stains all over her chest.
After it was done, a watery green liquid started coming out of her mouth. O_O
I have no idea how old she was. I'd had her for two years, and she was at least two years old when she came here. I never named her, but I'll miss her. She was a lovely salmon colour.
This is her in the middle:
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