Lnzsmith,
So she ate and then, had labored breathing?
When they are ill, they usually won't eat. This is interesting...
Don't be disheartened, you are doing a good job. Sometimes these chickens really test our feelings. Yes, there could be something else internal that is stressing her system.
Labored breathing happens when the heart is weak or congested, or the airway is obstructed, or even anemia (common in heavy mite infestation).
Have you tried a warm bath in dog flea shampoo? Then, you can blow dry her and apply some petrolatum jelly on the combs, wattles, earlobes, and around eyes. Also, spray some non-stick cooking spray on her vent area to protect it from any mites still on her. Any non-stick cooking spray will do, canola, olive oil, vegetable oil etc. The lecithin in the spray is nourishing for the skin too! I use it whenever I have to wash a chicken's vent area. Just did it this morning!
Now, you should also feel under her belly and between her legs. Do you feel any swelling?
If not, that's good.
I had an exasperating morning too!
One hen had diarrhea last night and this morning. So, I had to bathe her bottom and blow dry, then, administer some herbal remedy.
When I returned her to the pen, I noticed my other hen with eyes closed and puffed up.
When I felt her crop, it was squishy and made noises. I treated her, then went about my morning chores.
An hour, later I went to check on her. She was heaving, so I quickly picked her up and held her upside down slightly. So much undigested food came flying out. This is a very dangerous procedure, as the hen can choke or have a heart attack.
And, wouldn't you know - that's what happened! The hen started to lose consciousness, and the comb and face started to turn purple.
I held her, and talked to her while massaging and patting her crop. Then, I just asked God to guide me in helping my hen. I said, "Filamena, don't you die today, you are only two and a half years old." And then, I just started to do CPR on her.
After about a minute, she started to revive and opened her eyes, then the color started to return.
Whew! Thank you Lord!
Lnzsmith, don't get disheartened...do what you can, if she is meant to live another day, then that's what will be. If not, you will have your cry, and then, you can find a special place in the yard to bury her. I have done this three times this year, but not today!
God Bless and peace to you!