Eggbound hen?

[MarlaMac]

Thank you for all the help! She's about 10 months old, all of our flock have been together since chicks. I haven't given them wormer before... I'll definitely consider it.

It certainly won't hurt. You can give it to all of them in their water and you can direct dose her to get it in her more quickly. Here are two post that show both the "in the water" dosage and the direct dosage of corid.

https://www.backyardchickens.com/threads/corid-protocol.1674175/

https://www.backyardchickens.com/threads/could-this-be-coccidiosis.1677984/#post-28858593