@Belrose
I use dried oregano in my flock feed I have a Runner with water belly and she has been this way going on 3 yrs and hasn't gotten any worse. Still runs with the flock. But you can buy oil of oregano.
Look up you state forum there maybe someone there that could duck sit or at least come check on her daily and spend a bit of time with her.
https://www.backyardchickens.com/forums/where-am-i-where-are-you.26/