I'm sorry she's not doing well today.
How many cockerels/roosters are living with her?
Green poop can be associated with not eating. If she's not eating well because of the boys, then separating them out may be a solution.
Getting a fecal float from a vet can be a challenge. As mentioned there is a mail order service that you can buy off amazon. NC state labs also will perform them, I have not used their services yet. We have 4 labs, my understanding you can send or take samples to them so if one is near you, then I would call and ask how to do that.
http://www.ncagr.gov/vet/ncvdl/