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Female hands are a lot like male hands in many ways, they just tend to be smaller. Try to draw them using curves and 'soft' looking shapes, as opposed to harder shapes and straighter lines that you might use to make something look masculine.

It might be helpful for you to post what you have of the picture so far here, so we can give you more specific advice. Also, what sort of position do you want her hands to be in? Can you draw hands in general but can't make them look feminine, or is it that you have problems drawing hands at all?