Posting some ugly pictures here, sorry about that, i had to take them with flash when she was on her roost as she not keen about me holding her but she developed this maybe a week ago, i had thought a broken egg was stuck to her backside when she was laying but the mess persisted and most of it is white, runny it seems and a red swollen area (vent? i'm new to chickens and these hens i rescued) and obviously she's not laying. She still eats, drinks and walks around with the other hens although sometimes she seems more tired, i have no idea whats' going on or how to treat it especially if she only lets me handle her on the roost. No vet around here