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I agree with @Eggcessive when you mentioned the blisters were weeping, frostbite came to mind. I'd see how it goes, hopefully she'll recover quickly.

How long has the swelling been going on? What's the temperatures been like?

How are you treating the mites? I'd work on getting rid of them that are on her asap. You can use a Permethrin based poultry dust to dust her really well, make sure to work through the feathers all the way down to the skin. Repeat in 5 days intervals. Ivermectin is another option...