I read that older hens can sometimes lay this as they are getting closer to the end of their productive years. Their bodies are going through changes, sorta like women go through menopause except with chickens it is henopause.
ask your friend to check for internal laying, a post on here a while ago showed the autopsy of a hen that died from internal laying, when the person cut open the hen, they found 4 masses looking a bit like that, the hen could have passed an egg that previously got stuck