I'm sorry about your hen.
Without necropsy it would be really hard to know what happened. If you still have the body, refrigerate it and send it to your state lab or if you are up to it, do one yourself and investigate that way. Take photos and we'll try to help you with what you see.
I know that may not be for everyone, but a lot of us do our own - sometimes we do find something obvious. Most common issues with any laying hen is reproductive disorders (EYP, Cancer, Salpingitis, etc.), Fatty Liver Disease and/or some type of organ failure.
https://www.metzerfarms.com/PoultryLabs.cfm
Without necropsy it would be really hard to know what happened. If you still have the body, refrigerate it and send it to your state lab or if you are up to it, do one yourself and investigate that way. Take photos and we'll try to help you with what you see.
I know that may not be for everyone, but a lot of us do our own - sometimes we do find something obvious. Most common issues with any laying hen is reproductive disorders (EYP, Cancer, Salpingitis, etc.), Fatty Liver Disease and/or some type of organ failure.
https://www.metzerfarms.com/PoultryLabs.cfm