Here is a link to read about a couple of different chicks, but the first case is similar to yours: https://www.backyardchickens.com/t/6631/constipated-chick-with-swollen-vent
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Do you know how to tube feed? If so, you could tube some fluids and I bet that you'd see improvement very quickly. I tube something every day, so for me it's easy. If you're interested, I can teach you.The poops looked pretty normal just, large and a bit dry and no white cap.
Maybe some dehydration or bacterial imbalance in her gut