I am very lucky and our state poultry vet lives about 2 minutes from me. He did a necropsy for free out of the back of his truck. My girl had died of a liver rupture 

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I am so sorry.I just lost another hen, this is the second hen in 5 days. This one was a layer and 6 months old and seemed very active and healthy. I found her stiff on her perch this morning just lying there like she passed in her sleep.
Yes and YesI am so sorry.
This is a very old thread so these people may not respond to you.
Are you in the US? Are you ready to get a necropsy so you know what you are dealing with?
If yes...I can point you in the right direction.
What state?Yes and Yes
MichiganWhat state?
Please stop feeding your birds all the treats.Michigan
I feed them Kalembach crumbles and scratchPlease stop feeding your birds all the treats.
Stop all of them and feed ONLY layer pellets or crumble.
Here is your state lab.
https://www.animalhealth.msu.edu