You may be able to see mites on her by parting her feathers and looking at the skin and feather base, especially around her vent and beneath her wings. They are TINY. If she has them, I would treat her with a permethrin based dust or spray (if it’s warm enough where you are), which you can get at a feed store or online.How do I treat mites and is there a way to know that's what it is?