Do you know when exactly the red hen last laid an egg? Keep her separate from the other hens until she is healed. She might be eggbound or have a tumor/cancer obstructing the cloaca.I don't think they have shells in there. In fact only the white one had egg thingy and she went roosting and generally seems better but she'll be isolated tomorrow to be sure. The red one with bloody vent made a position like pooping or laying an egg and i noticed that there was something sticking out of her vent! And some of this diarrhea wa leaking through it drop by drop! I couldn't catch it on photo but it seemed very painful. I isolated her in basement for night because when i put her in the coop a hen pecked her at the vent and she ran away. I don't know what to do.
If you give her the calcium tablets she might be able to get the egg out, in case it is an egg. If it is some kind of tumor, only a vet might be able to help.
Even better to give Calcium + Vit D3+VitK, those tablets for humans would do.
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