Sick chicken help!

What’s wrong with her? Her poop is very watered down she’s a little lethargic but she’s still walking about but she isn’t running to me like she usually does she’s still eating and drinking but she’s drinking a lot more water i didn’t notice any symptoms until a day ago. I also noticed her feet have scabs on them but it doesn’t seem like bumble foot and it’s only on her back toes I also checked her duct and it has poop on the feathers around it but her duct itself looks fine no redness or swelling she is an older chicken pushing 4 years old