It means that worms can cause nutrient deficiency among other issues, resulting in egg problems.What does that mean
She is vaccinated and is in a small flock. She is perfectly healthy. She just lays slightly strange eggs
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 describe. They hide issues quite well and even for a long time.
My hen laid a shelless egg the other day. There was egg in the nest box and the membrane was next to it. I was very confused.
She usually lays weird eggs; elongated and sometines blocky. Most of them have "leftover" shell pieces on top of the original egg.