There is a reason it is building up like that and it doesn't seem normal at all!. I'm going to throw this in the mix. Do you have a lot of flies right now?
Does her vent look normal?
Do you think she had a prolapsed vent causing the blood smears?
Can you separate her from the flock while you treat her?
@Eggcessive @Aunt Angus @AmeraucanaHank