My new girl is getting slowly ontroduced to my 3 other slightly older hens she is a sex link named Ruby very sweet girl but ive noticed she has very runny stool I got her from the feed store I gave my rooster to she was in a pen of about 30 sex link hens ive had her a week now shes eating good and all and is able to free range the backyard supervised so she doesnt get beat up could it be from stress in the move and the introduction to the other birds or should I check for something else