Sounds like she’s had a respiratory issue with the sneezing and pufffy eye.
From what I understand there are many bacteria/viruses that can cause respiratory illness in chickens and a lot of chickens can be carriers without symptoms, but in times of stress or lowered immunity they can show symptoms.
Maybe she had an allergic reaction to something or got something caught in her throat or nose.
Has there been any particular change recently? Predator attack, weather spike, different food, etc?
How is the ventilation in your coop? Proper ventilation and no draughtiness is important for chickens respiratory health.
The extra floppy comb could be from dehydration. Green poop can be from lots of things — eating lots of grass/greens, malnutrition, infection or heavy metal toxicity.
Hopefully she has just stopped laying because she’s been unwell or because of the season. You can feel around her abdomen (between keel bone and vent) for any changes. Feel your other birds for comparison. Layering birds should be soft and squishy without too much distension.