How is she acting? Is this the only dropping like this? Do you have a vet that will run a fecal test for you? They can check for coccidia and other internal parasites. That looks like intestinal shed rather than blood (unless color is not showing accurate in picture or on my monitor). Occasional shed can be nothing to worry about. If you are seeing a lot of it, or if it gets worse, or if the chick seems off
at all, lethargic or sleepy, or not eating and drinking well, I would treat for coccidiosis to be safe. Coccidiosis is very common in chicks and in birds that are moved to new ground, treatment is very safe and will do no harm even if it's not coccidiosis. And if it IS coccidiosis, some strains can progress quickly and be fatal quickly. Treatment is Corid (if you are in the US), available at many feed stores, tractor supply stores, and on line. You can use either the powder or the liquid, I will attach pictures of both. If you suspect it's coccidiosis then start treatment as soon as possible.
Dosing for the liquid is 2 tsp per gallon of water for 5 -7 days, then 1/2 tsp per gallon for 5 -7 days, make fresh daily and make sure it's the only water available.
Dosing for the powder is 1.5 tsp per gallon of water for 5-7 days and then 1/3 tsp for 5-7 days, make fresh daily and again has to be the only water available (no puddles, streams, ponds, other water sources, etc).
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