If your hen laid a lash egg then she has what's called Salpingitis. Heavy antibiotics might help but she may never lay again if she's able to be cured.
Sometimes lash eggs are present when the infection has ran amok in their system for a while, and sometimes might be too late to treat.
https://the-chicken-chick.com/salpingitis-lash-eggs-in-backyard/
Here are a list of symptoms and various images of lash eggs. Not all lash eggs look the same and this link has lots of references to different looking ones.
Sometimes lash eggs are present when the infection has ran amok in their system for a while, and sometimes might be too late to treat.
https://the-chicken-chick.com/salpingitis-lash-eggs-in-backyard/
Here are a list of symptoms and various images of lash eggs. Not all lash eggs look the same and this link has lots of references to different looking ones.