Hard to choose! Several of the names are quite pretty and fit well with the sib set.
The only name that I don't think works well is Molly. It just doesn't seem to have the same elegance as Nora. But I think any of the others work just fine!
You will be able to change your vote.
IMO, Stella (while really cute and spunky) is too matchy (as is Tessa).
I really like Ruby, Tessa, Ruth and Gwen. They are all pretty with big siblings Nora and Wade. Out of the four the first I eliminated was Tessa, because it has five letters rather than four and the same ending as Nora. (It could still work fine, but I do like all of these). Next I eliminated Gwen, as it is a nickname.
Ruby and Ruth are both excellent, so I chose Ruth mostly because it is less common and ends in a less common sound.