Congratulations!
I love Cordelia and Magnolia with Tallulah, Ruby, and Wolf! Using Cordelia could be a nice connection with Tallulah so she’s the not the only one without an English noun name. I don’t think many people would notice that three of the names are English nouns and one isn’t, but I can certainly understand why you’d want a name that’s not a noun to loop Tallulah in. All that said, since Tallulah does mean “town” or “leaping waters” depending on the language, I would consider that as a noun name! Therefore, using Magnolia wouldn’t be a problem.
Persephone “Posy” (it would then connect to Tallulah’s name and Ruby and Wolf’s explicitly nature names!)
Penelope “Poppy” (ditto with Persephone “Posy”, you could also use the nicknames Nellie or Penny)
Perpetua “Poppy”
Josephine “Posy”
Matilda
Genevieve
Adelaide