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Translations: Bleach 600 by BadKarma
I think the snow snow fruit totally suits nami, due to the whole weather theme, plus it could enhance her climatact skills.
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Not sure if she wants to lose her "humanity" and that would only enhance her control over snow, while she is a witch of every kind of weather.
I don't think she will, nor should she. The snow snow fruit, or any kind of devil fruit, would be a horrible choice for Nami. She's better off being a human who can swim rather than be specialized in snow and sink.
And what about Nami's Climatact? I am just suggesting it as an option. Nowhere I will state as to how would she control it afterwards or so, simply clueless.