If you're already planning to promote the better Nanna and you haven't given any skills to the 5-star you have, I'd probably go ahead and fodder her if you'd like her staff on Mia.
Personally, I try to get the 4-star healing skills on all my healers, so I'd start with that. Then, you'll be ready to fodder any additional 5-star level healing skills to her if/when you pull healers you don't otherwise want or if you choose to promote them for their skills later. I'd try to get all of them on her, starting with what's most readily available to me (that I don't otherwise care about/want).
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