I'd have a hard time not thinking that was lash looking.
Okay.. so avian and poultry may not be the same specialty.. This link has a list of poultry vets listed by county.. Maybe you could at least call them and ask some questions to see if they might be worth visiting...
Could be ascites, otherwise known as waterbelly. or internal laying called egg yolk peritonitis which both are different than salpingits.. What color was the fluid? (soft eggs mentioned could indicate not EYP)
If she's laying lash eggs.. and also has fluid on the belly.. sounds like more things...