I am going to go out on a limb and say, "Perhaps not."
Well, I mean, some folks call it the uterus and some call it the "shell gland." It isn't as tho' it has gone anywhere or just disappeared. The hen (pullet?) still has all the parts or she would not be producing the eggs. The parts are not working just right, however. Probably the egg is moving too quickly thru the uterus for the shell to form.
Very few hens will produce an egg every 24 hours. Even for the best layers, it will run slightly later each day until there just won't be enuf daylight to trigger all the hormones necessary for the release of the next yolk from the ovary. Perhaps, she just needs that break, to get herself back in synch.
Here are
some articles at Poultrysite on eggshell quality. Notice how the idea of a young pullet, new-to-lay keeps coming up. Also, realize how much calcium is passing thru with the egg. It is a lot! If she is laying an egg every day, or nearly so, that bird needs really a lot of calcium in her diet.
I hope this is some help to you . . .
Steve