Hey Egglayer1234
I am sorry you are going through this and I wish I could be more helpful but as I mentioned, I am not an expert and simply ruling out things or looking for causes as I would if it was one of my gals.
If it is early morning where you are, her crop should be reasonably empty...
Howdy Egglayer1234
Apologies that I am not an expert either but just wondering what her crop feels like? Is is really full and hard? Empty? Full but squishy?
Her breathing may just be as a result of her being in stress, not an actual breathing difficulty.
What is your weather like at...