I love your daughters' names so much. Beatrix has always been one of my favorite girl names. I don't think Penelope is too close to Eloise, I think it's the best from your list. Penny, BeBe and Eloise! (Ellie? Does she use a nickname?) Also, Clementine has also long been on my list of favorites and that's partially because I fell in love with the nickname Clem.
Wilhelmina/Willamina (Willa/Mina/Mimi possible nicknames)
Love Annabel, Penelope, and Rosalie! I also love Charlotte but I think it's way too popular to go with your other girls' names. Suggestions;
Cora (or short for Cordelia or Coralie or Coraline)