I can see why you are concerned with peritonitis.
Watery poops can sometimes mean they are just not eating enough. If she is under the weather (there could be bucket full of reasons why)this maybe why she’s not eating. I’ve just looked at her pics close up and some of her comb looks like it has mud on it rather than it being black. Have you washed her comb at all to have a good look?
Along with frostbite combs can sometimes change colour to a blue or purple tinge due to cyanosis which is a circulation problem.
When you say she has a baggy crop, have you considered pendulous crop?
Watery poops can sometimes mean they are just not eating enough. If she is under the weather (there could be bucket full of reasons why)this maybe why she’s not eating. I’ve just looked at her pics close up and some of her comb looks like it has mud on it rather than it being black. Have you washed her comb at all to have a good look?
Along with frostbite combs can sometimes change colour to a blue or purple tinge due to cyanosis which is a circulation problem.
When you say she has a baggy crop, have you considered pendulous crop?