Labored breathing can be from a number of things.
At 6 years of age, I would lean more toward a reproductive disorder - Cancer, EYP, Salpingitis, etc. Fatty Liver Disease or a failing heart could be issues as well.
It's really hard to know unless there's further investigation when you lose...
Not sure what your goal is?
She's healthy - looks great, very alert, can roost, eat/drinks, crop empties, no lice/mite, moves around just fine, tail up, bright eyed.....
She's 6 years old. She's lounging about. Some older Gals do that. If she seems happy within herself, I personally don't...