I never use cedar. I know it smells nice but it has a lot of aromatic oils that can be irritating to some pets. You may have to take her to the vet to be checked. If no sign of eczema or parasites, it may be a sensitivity to something that will require trial and error by you - bedding, foods, whatever you use to clean her cage. The vet can prescribe creams and steroids if it's very bad.
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