I am glad that she is better. You could still up her calcium/phosphorus intake by adding the powder to her diet as suggested:
And maybe some additional vitamin C would help as well to build a healthy egg shell.
She might as well just have a congenital defect of the shell gland or congenital...
It means that worms can cause nutrient deficiency among other issues, resulting in egg problems.
What kind of vaccinations exactly did she get?
Can you post a picture of some of her eggs?
Although you say that "she is perfectly healthy", a perfectly healthy hen would not lay the kind of eggs...
You're welcome!
As these high production hybrid hens have an enormous egg output, the normal calcium uptake will not suffice. you could also up her intake by adding calcium phosphate in form of powder to their diet. Just mix some germ oil with the pellets and add the calcium powder, mix well...
Sadly, what you describe is the route most high productions hens will go rather sooner than later, as their reproductive tract cannot endure the high egg production without getting damaged.
You can try to feed her 1 tablet for humans per day for 7-10 days: 600 mg Calcium+Vit. D3+Vit.K
It...