Leonora - it's pretty but might be shortened to Leo. I know a Leonora who is Leo 99% of the time. As it's quite long it's harder to avoid nicknames (it's possible when she is little but later on she will decide what she wants to go by). As nicknames are more likely to come from the first syllables of a name I think introducing Nora will be more difficult (and as it is shooting up in popularity there might be a Nora in her class already) and I would assume that she will become Leo. I would think about whether that would bother me. I personally dislike Leo on a girl.
Juliet - it's pretty but very much associated with the play and a bit tragic because of that.
Jolene - sorry, I find this a bit 1950s and a bit not-so-classy. I also dislike the nickname Jo.
Caoimhe - it's fine. Personally I'm not a huge fan of the sound but it looks pretty. I remember two of my Irish friends fighting whether it's kee-va or kwee-va (it's apparently a regional thing but both were convinced that the other pr. wasn't correct). I'd be prepared to correct people a lot and to even have some Irish people go "the pronunciation is incorrect" due to it being kwee-va in their accent (to the best of my knowledge both pronunciations are indeed correct but I would genuinely check this with some Irish language institute or something).
Bree - not bad but more of a nickname. Brie (pr. bree) is also cheese. Maybe for Briana, Briella, Brielle.
Emmeline - cute. I prefer -leen. But maybe not a good time to use this with all the Emmas and Emilys already around. -leen also makes it sound a lot like Emily. My husband loves Emma but I can't get 100% on board because of its former popularity.
Out of these I feel like Bree would be refreshing but I'd look for a longer version as Bree by itself reminds me of the cheese too much to put it on a birth certificate. Juliet, Emmeline, Leonora are fine too. Caoimhe is pretty but I find it a bit bland because it feels whenever people want an Irish name they choose Caoimhe or Aoife.
Bree feels refreshing because it doesn't have sounds in it that are currently so popular (Eva, Ava, Evelyn, Ada, Ayla, Isla etc.).