Kwini they are lovely sounding names in themselves, but if your DD is growing up here, I think the associations I made would be uppermost in most people's minds.
I prefer Sarie to Roux, since, as you say, the sari connection is a pretty one (whereas Roux will have lots of people mentally straight back in a domestic science lesson). She would also get people thinking it was "Roo" or "Rue" which personally I would dislike.