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Sounds like she's having reproductive problems. https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/

It's very possible the "dust" from the new bedding & DE is a cause for her sneezing. It's good that you opened the windows, not good for you to breath either. Depending how "damp" the coop gets, it maybe causing some issues ... mold/mildew. Do you have enough ventilation? Great that you...

A video would help ... You put in on to YouTube then link it here. You say her crop is full but not hard. Check her crop in the evening (should be full) then again in the morning (should be empty). Have you checked her for mites? Look thru her feathering (under wings, vent area, neck) you...