Pure blood from chicken? And blood in poop?

[ChickenNuggie22]

I’m asking for my mother in law that has a chicken she saved from a coop fire a few weeks ago. This hen is a silver laced bantam polish. She sent me these pictures and I am not sure what to tell her. I initially thought coccidia, but with the huge blood clot, I’m unsure since any of my chickens I’ve had never had that much blood even with parasites. She does treat with ivermectin and corid. Maybe she needs to treat again? Internal bleeding from the fire? She lost a few chickens in the fire and this one had a surviving mother hen that recently suddenly died. They both suffered burn injuries like burned feathers and feet. She has been inside with my mother in law since the fire. She said the blood on her face is due to the hen trying to eat the blood clot…
Any idea on what this may be so I don’t tell her the wrong info?

 

[MysteryChicken]

Pictures of her vent?