I would pick either
Chloe or
Sophia.
Olivia,
Sophia and
Chloe are amongst the most popular girls names in the U.S. at the moment, but
Chloe is a little further down the list so maybe she wont be one of three other girls in her class with the same name. I like the sound and meaning of
Sophia the best, but it is ridiculously popular at the moment, and she might not want to be in a crowd of Sophias.
Olivia is almost as popular as
Sophia, but I've never seen the draw. It just sounds like an olive and means olive. Olives are okay tasting but I don't like them enough to name my kid after them.