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Is seen that Monet was not a Harpy from the beginning, so it was probably Law that gave her those legs and wings with his power.

then her powers should'nt work on those "fake bodyparts" like Crocodiles hook don't turn in to sand, it is possible she got her devil fruit powers after Law changed he body, if that is not the case this must be a mistake on Odas part.

some will say her powers work on those because her bodyparts is "real" but her powers is in her body NOT in her soul, if it was so then Smoker should have been able to use his power in Tashigis body which he was not but Tashigi was able use Smokers powers i his body.