Good to know.
Here, most state labs will take the bird from individual keepers but some require going through a vet, each state is different.
A lot of keepers like me, just perform our own informal necropsy to see if we find anything "obvious" that may give us a clue to do some research...
:( I'm sorry to hear this.
Can you take or send the body to a vet lab or agriculture of ministry for testing/necropsy?
I'm not sure what you call the services in AU, hopefully @Lillith37 might know.
Here in the U.S. each state has lab services, most all countries have some type of lab...
Do you provide grit (crushed granite) for your birds or do they have access to soil that contains small sharp stones/rocks?
I would feed a wet mash of food instead of grains. Sounds like a possible partial blockage if she's expelling bits of grass and whole grains.
Check the crop first thing in the morning before she's had anything to eat/drink, if it's empty that's good news.
If it's not empty, then give her crop a light massage a few times a day.
If she's eating a lot, then the crop is going to be filling up during the day, it's like a pouch that...
What are you calling "shell grit" - oyster shell? That's great for adding supplemental calcium but it's not hard enough to act a grit in the gizzard.
She can have her normal pellet or crumble poultry feed (wet or dry) and easy to process food like the egg you gave. I would avoid whole grain...
It would be a good idea to continue with your existing thread instead of starting a new one. Here is the one about the LICE.
What is in the photo on her eye is a louse. Permethrin will take care of the issue.
https://www.backyardchickens.com/threads/mite-id-urgent.1602676/#post-27269876
For...