Also, from time to time I hear her making a weird breathing sound out of her nostrils. Is that normal? It's just a quick puff of air that I can hear her breathing.
It looks like she's either pulling her feathers out, she's molting, her feathers are burned off from being around ammonia, or she could have lice/mites.
As for the breathing, if you hear wheezing, gurgling, sneezing, or see bubbly eyes or dripping nostrils, she could have a respiratory disease.
I do not believe she has a mite or lice problem because I sprinkle diatomaceous earth in their dust baths and I put some bleach in their water every now and then. Also, she does not have a respiratory issue because I checked for what you told me to check for. I don't think she is pulling her feathers out because I never see her doing that.