Disclaimer: not a diagnosis. Only a vet can do that.
Your hen, from my own experience with such symptoms, probably has low blood calcium and is not forming shells on her eggs. Shell-less eggs are very hard to pass and often become stuck, causing the next egg to crowd behind it, compounding the issue since she would only have calcium for one of the eggs.
The obstruction of these eggs will cause the crop to slow and often will cause crop issues that also need to be treated. This is where you are.
The solution is to give her calcium citrate daily for several days to a week to bring up her blood calcium. Pop the entire giant tablet into her beak. Get this at the store where you find human vitamins.
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