Could the red dot have been blood or intestinal shedding?Her feed is fresh, no mold. Ill try to get some photos, but i haven't seen her poo. Coccidiosis could be the cause. I've never had chickens before and this is my first time so im unsure..
edit: i checked on her again and saw a small red spot in the dirt and a normal dry looking poo beside her. I apologize for no photos, my phones camera quality isnt the best and most pictures look pixelated or blurry. im trying to give you awnsers as best as i can.
If you have some Corid, you may want to go ahead and treat her.