She may want to avoid names that also end in -ra and -ia, although it's not essential. She may also want to stick with ending in A.
Of the names suggested so far, the ones that seem most "little black dress" to me are
And to a slightly lesser extent
I'll throw into the mix, not perfect but if she likes them in the realm of the plausible:
Claire (I like this the best because it does NOT have an "a" ending, in order to avoid being too matchy match)
oh, and Caroline would be perfect. Claire and Caroline are my top choices, followed by Sarah and Anna
My friends loves both Anna and Fiona. Thanks to all! Of the two, I personally prefer Fiona but wonder if it is trending too much right now. I think that Anna is beautiful and more timeless, but is a little more plain.