Is the hen still acting like she needs to expel more that may still be inside? If there's a fluid leaking from her vent, there likely is more in there. If she's still hunched and pulsing at her vent, that's more reason to suspect she has material still needing to come out.
Not all hens can digest oyster shell and the calcium carbonate in layer feed to make strong shells. From time to time, this can occur. The treatment is calcium citrate which is far easier to digest and absorb. She needs around 600mg per day for a few days until her calcium reserves build back up. You'll know the reserves are topped off again when she's laying good shell eggs. Then she can go back to oyster shell. This is what you want to get. Give one tablet each day directly into her beak.
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