I really like Seren. I'd never heard that name before your post -the meaning is pretty too.
I also really like Coraline although I imagine that your daughter would forever be correcting people who think her name is Caraline or Caralyn -just like in the movie/book. So, I would go with Coralie instead.
I like Eloise but it has an odd meaning (healthy; wide).
Adelaide (I 2nd pp's suggestion)
Seren -- I find this name to be extremely pretty and sweet! I know many associate it with the gas used in chemical warfare though, as it is pronounced the same way. If that bothers you, then some alternatives could be: Serene/Serena, Wren, Wrenna, and Fern
Juliet -- Very pretty and classic.
Holland -- Nms. What do you think of Ryland for a girl? I love the nn Rye. :)
Coraline or Coralie -- These are pretty! I prefer Coralie.