RichnSteph asks a very good question and the first one that popped into my head as well. Sometimes early into the laying game - or even on occasion with more reliable hens - there'll be hitch in the works. Doesn't mean there's an earth shaking problem unless it's all you ever get from that hen. Then I would suspect some reproductive issues or deficient diet. But when they first start laying the entire assembly line isn't always in sync. As they age and lay more regularly, that just goes away.
Mine love hard boiled eggs, chopped up coarse with shell and all. I usually use the eggs that are old enough not to want to sell them to my customers, but still fresh enough to use.
Edited to add - I have to learn to pay more attention to that little post notifier on the bottom of the page.... you can try adding stuff to the diet like yogurt, some feed Fermented Food, and the eggs, as I mentioned. But laying very large eggs consistently is tough on their little systems.