Chicken with a poop that came out as pellets

[egyptchick]

One of my laying hens had a poop in front of me. It seemed to be clear mucus and then she passed some bullet shaped poops. They seemed hard in consistency. She has no other symptoms and didn't seem to be bothered by this. She ran away and in my rush to catch hers the other chickens ate the poops so I couldn't have a good look.
Is this something I should be worried about? Should I quarantine her?