This is purely hypothetical. I just [name]LOVE[/name] the group [name]Lucy[/name], [name]Violet[/name], and [name]Elise[/name]. But I need four more GIRLS names that round out a great sibset of seven (the number I always use when planning sibling names). I’m debating [name]Cora[/name] right now… 
So give me your best four to complete it please!!
[name]Cora[/name] came to mind before I read your post-- so I’d say put it in the sibset. Other suggestions:
[name]Lucy[/name], [name]Violet[/name], [name]Elise[/name] (I would do [name]Eliza[/name] instead), [name]Cora[/name], and
[name]Anne[/name]/[name]Anna[/name]
[name]Alice[/name] (if no [name]Elise[/name])
[name]Beatrix[/name]
[name]Claire[/name] or [name]Clara[/name] (if you don’t use [name]Cora[/name])
[name]Daphne[/name]
[name]Faye[/name]
[name]Fiona[/name]
[name]Helen[/name]
[name]Jane[/name]
[name]Julia[/name]
[name]Maeve[/name]
[name]Mae[/name]/[name]May[/name]
[name]Mary[/name]
[name]Phoebe[/name]
[name]Rose[/name]
[name]Sarah[/name]
[name]Sybil[/name]
[name]Tess[/name]
[name]Zoe[/name]
[name]Sara[/name] came to mind for me too. Other thoughts are month names for some reason: [name]May[/name], [name]June[/name], [name]Julia[/name].
[name]Lucy[/name], [name]Violet[/name], [name]Elise[/name] and
[name]Amelia[/name]
[name]Julia[/name]
[name]Claire[/name]
[name]Stella[/name]
[name]Olivia[/name]
[name]Caroline[/name]
[name]Ava[/name]
[name]Ivy[/name]
[name]Rose[/name]
[name]Harper[/name]
[name]Madeline[/name]
[name]Scarlett[/name]
[name]Eleanor[/name]
[name]Sophie[/name]
[name]Sadie[/name]
[name]Mae[/name]
[name]Chloe[/name]
[name]Nora[/name]
[name]Lucy[/name]
[name]Violet[/name]
[name]Elise[/name]
[name]Adela[/name]
[name]May[/name]
[name]Norah[/name]
[name]Pearl[/name]
[name]Isla[/name]
[name]Maeve[/name]
[name]Julia[/name]
[name]Tessa[/name]
I love [name]Lucy[/name], [name]Violet[/name] and [name]Elise[/name] together! Each one is very individual but they sound perfect together too and are all feminine, sweet, pretty but not frilly. I also love that they have unique initials and endings so to round out the set I like:
[name]Primrose[/name], [name]Florence[/name], [name]Iris[/name], [name]Beatrice[/name], [name]Kate[/name], [name]Clara[/name], [name]India[/name], [name]Anna[/name], [name]Martha[/name], [name]Willa[/name], [name]Thea[/name], [name]Tessa[/name], [name]Jessamine[/name], [name]Josephine[/name], [name]Jane[/name], [name]Willow[/name], [name]Olive[/name], [name]Nell[/name], [name]Belle[/name], [name]Mabel[/name], [name]May[/name], [name]Maeve[/name] & [name]Matilda[/name]
My set would be:
[name]Lucy[/name], [name]Violet[/name], [name]Elise[/name], [name]Clara[/name], [name]Jessamine[/name], [name]Florence[/name] & [name]Belle[/name] 
Without looking at other suggestions my thoughts are…
[name]Lucy[/name], [name]Violet[/name], [name]Elise[/name], [name]Tess[/name], [name]Cora[/name], [name]Phoebe[/name], and [name]Olive[/name]
[name]Asha[/name]
[name]Mara[/name]
[name]Maren[/name]
[name]Sarah[/name]
I think cora works perfectly!
[name]Stella[/name] would be another great option
Other suggestions:
[name]Maia[/name]
[name]Claire[/name] or [name]Clara[/name]
[name]Vera[/name]
[name]Delia[/name]
[name]Julia[/name]
[name]Jane[/name]
[name]Fay[/name]
I think [name]Cora[/name] would be a great addition. Other names you may like are [name]Lucy[/name], [name]Violet[/name], [name]Elise[/name], and…
[name]Stella[/name]
[name]Bethany[/name]
[name]Grace[/name]
[name]Maya[/name]
[name]Bella[/name]
[name]Hazel[/name]
[name]Melody[/name]
[name]Carys[/name]
[name]Helena[/name]
[name]Isolde[/name]
[name]Bridget[/name]
[name]Daphne[/name]
[name]Georgia[/name]
[name]Cecily[/name]
[name]Audrey[/name]
[name]Gemma[/name]
[name]Felicity[/name]
[name]Lucy[/name], [name]Violet[/name], [name]Elise[/name] and sisters…
[name]Clara[/name] (instead of [name]Cora[/name])
[name]Annabel[/name]
[name]Meredith[/name]
[name]Josephine[/name]
I love love love [name]Lucy[/name] and [name]Violet[/name]! [name]Elise[/name] is nice, but I prefer [name]Elsa[/name]. I like [name]Cora[/name] better as a nn for [name]Corinne[/name] than a stand-alone name. What about [name]Nora[/name] or [name]Eleanor[/name]? I also really love [name]Clementine[/name] and [name]Beatrice[/name]. [name]Hazel[/name] could work, too. And [name]Pearl[/name] or [name]Ruby[/name], but I can only imagine using them for babies born in the appropriate months to have those birthstones. That’s probably silly of me, though.
[name]Lucy[/name]
[name]Violet[/name]
[name]Ruby[/name]
[name]Elise[/name] (I personally prefer [name]Alice[/name] since I think it’s more of a classic full name, and there are just too many names like [name]Elise[/name])
[name]Cora[/name] or [name]Clara[/name]
[name]Anabel[/name] or [name]Annalee[/name]
[name]Mariah[/name] or [name]Marilyn[/name]
[name]Julia[/name] or [name]Jillian[/name]
[name]Ivy[/name] or [name]Iris[/name]
If it were me, my picks would be [name]Lucy[/name], [name]Violet[/name], [name]Ruby[/name], [name]Alice[/name], [name]Clara[/name], [name]Mariah[/name], [name]Iris[/name]
[name]Charlotte[/name]
All the others have an “L” in them so [name]Charlotte[/name] matches well.
[name]Lucy[/name], [name]Violet[/name], [name]Elise[/name] and [name]Charlotte[/name].