Here are the facts. I've searched the forum and did not find a post like mine:
Australorp
Under a year
At first laid about 3-5 eggs a week
Hasn't laid one egg in four+ months
Things we've investigated and ruled out:
Not molting
No lice/ no mites
Has access to water and food 24/7
Gets along with other two chickens
Gorgeous looking--best looking of the three--fat, glossy feathers, walks and runs fine
Eyes clear
Hangs out with other two chickens and travels with them when we let them free range
Is not eating her eggs
Does not hang out in the nesting box during the day (not brooding)
Not a rooster!
The sexlink in the trio lays every day a firm shelled egg
The third chicken, still a pullet, has not yet started laying
Australorp stopped laying months before we got the newest chicken
Any ideas?
Australorp
Under a year
At first laid about 3-5 eggs a week
Hasn't laid one egg in four+ months
Things we've investigated and ruled out:
Not molting
No lice/ no mites
Has access to water and food 24/7
Gets along with other two chickens
Gorgeous looking--best looking of the three--fat, glossy feathers, walks and runs fine
Eyes clear
Hangs out with other two chickens and travels with them when we let them free range
Is not eating her eggs
Does not hang out in the nesting box during the day (not brooding)
Not a rooster!

The sexlink in the trio lays every day a firm shelled egg
The third chicken, still a pullet, has not yet started laying
Australorp stopped laying months before we got the newest chicken
Any ideas?