I see you're from Oklahoma, this is what I found:
Feathered Friends Parrot Rescue. Central Oklahoma; Anita Bertram, (405) 598-8528.
Fight 4 Flight Parrot Rescue, Inc. 501(c)(3) nonprofit. Claremore, Okla., Janet Sullivan, 918-283-1264; Skiatook, Okla., Lynn Hatfield, 918-396-7882...
I would make the neighbor aware of the hen and chicks. I don't think I would leave them be, because with the chicks, momma will be more vulnerable now. The chicks and momma will need to get easy access to food too.
Please consider checking for any birds at shelters. There are so many birds waiting for families, you may find the right one for you. I have a scarlet macaw that I found through pet finder and she was at an animal shelter about 50 miles away.
I was reading on breathing problems, could this be your problem:
Infectious Bronchitis
Synonyms: IB, bronchitis, cold
Species affected: Infectious bronchitis is a disease of chickens only. A similar disease occurs in bobwhite quail (quail bronchitis), but it is caused by a different virus...
If her crop was swollen, it could be pushing against her windpipe. It sounds like that isn't the problem though. I've read in other posts that gape worm could be a possibility or some other respiratory infection. I've read that regular wormers don't get rid of gapeworm. It seems you are...
Perhaps someone else can answer better, but I've always been under the impression that hay should not be used. Mine have gotten into hay before and ended up with an impacted crop. I'm not sure what sudan grass/hay is though. Does her crop feel full?