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It might be worthwhile having her doctor check her hormone levels: thyroid, estrogen, FSH, LH, etc. There are some ovary conditions that can cause overproduction of hormones, including testosterone-like hormones, that can cause hirsutism.
This can occur regardless of whether she has started her periods.
Just have her doctor do a good physical exam and check where she is in puberty and her hormones and if necessary she can be referred to a gynecologist for further evaluation.