I really love your daughter’s names. They are darling.
For their sister I love [name_f]Zoe[/name_f] or [name_f]Holly[/name_f] from your list.
I wouldn’t use [name_f]Annabelle[/name_f] as in my opinion it is to similar to [name_f]Sophie[/name_f]'s middle name.
If you haven’t got a middle name already picked out how about either [name_f]Zoe[/name_f] [name_f]Isabelle[/name_f] or [name_f]Holly[/name_f] [name_f]Isabelle[/name_f]. I myself prefer the [name_f]Isabel[/name_f] spelling though.
In my opinion a first name with two syllables is the way to go. Some ideas for you… [name_f]Phoebe[/name_f], [name_f]Cora[/name_f], [name_f]Daphne[/name_f], [name_f]Xanthe[/name_f], [name_f]Mira[/name_f], [name_f]Charlotte[/name_f], [name_f]Marie[/name_f], [name_f]Mary[/name_f], [name_f]Katie[/name_f], [name_f]Elise[/name_f], [name_f]Esme[/name_f], [name_f]Esther[/name_f], [name_f]Estelle[/name_f], [name_f]Norah[/name_f], [name_f]Nora[/name_f], [name_f]Freya[/name_f], [name_f]Jasmine[/name_f], [name_f]Caitlin[/name_f], [name_f]Ivy[/name_f], [name_f]Iris[/name_f], [name_f]Clara[/name_f], [name_f]Beatrice[/name_f], [name_f]Katherine[/name_f].
Other ideas… [name_f]Eleanor[/name_f], [name_f]Harriet[/name_f], [name_f]Juliet[/name_f], [name_f]Julia[/name_f], [name_f]Faye[/name_f], [name_f]Claire[/name_f], [name_f]Elizabeth[/name_f], [name_f]Eliza[/name_f], [name_f]Grace[/name_f], [name_f]Olivia[/name_f], [name_f]Amelie[/name_f], [name_f]Amelia[/name_f], [name_f]Madeline[/name_f], [name_f]Naomi[/name_f].
[name_f]Hope[/name_f] this helps.