:hugs Oh no! I'm so, so sorry :hugs
I know you tried your best to help her.
Getting a necropsy through your state lab will give you some answers or if you are up to it, perform your own informal investigation. A lot of us do our own, it's not something that everyone wants to do, but I've...
If she is not lethargic or in respiratory distress a soaking may help. Soaking can possibly send them over the edge if they are in bad shape, so use your judgement on that.
I would also consider antibiotics if you drain her. You can order Baytril or Amoxicillin online. For this, Baytril...
The wheezing could be from fluid or a mass in the abdomen that is pressing on the air sacs. IF there is fluid, you can try draining her to give her some relief. It's not a cure, but it could make her more comfortable.
The bloated abdomen is what's pushing her legs further apart.
I'm very sorry.
I'm sorry to hear about your hen.
Is she in respiratory distress right now? Gasping/difficulty breathing?
The abdomen does look a bit swollen/distended from the photos, she has a fairly wide legged stance. She may or may not have fluid in the abdomen, it's really hard to know. Ascites (fluid...