[name]Sister[/name] name for [name]Fable[/name] [name]Rose[/name]?
I like to do an unusual first name and traditional middle.
example: [name]Piper[/name] [name]Allison[/name]
[name]Story[/name] [name]Violet[/name]. [name]Just[/name] playing 
[name]How[/name] about
[name]Bay[/name] [name]Isabella[/name]
[name]Noor[/name] [name]Josephine[/name]
[name]Windsor[/name] [name]Katherine[/name]
[name]Posey[/name] [name]Margaret[/name]
[name]Rumer[/name] [name]Lillian[/name]
[name]Scout[/name] [name]Elizabeth[/name]
[name]Evie[/name] [name]Sarah[/name]
[name]Dulcie[/name] [name]Kate[/name]
[name]Zara[/name] [name]Vivian[/name]
Rumi [name]Victoria[/name]
[name]Tulip[/name] [name]Bryony[/name]
[name]Calla[/name] [name]June[/name]
You could reverse the themes:
[name]Ivy[/name] [name]Sonnet[/name]
[name]Jessamine[/name] [name]Story[/name]
[name]Poppy[/name] [name]Poet[/name]
etc.
Ooh I love [name]Fable[/name] [name]Rose[/name]! Sounds like a storybook character. I’d go with another wordy name, maybe something nature related? [name]How[/name] about:
[name]Poppy[/name] [name]Jane[/name]
[name]Blossom[/name] [name]Victoria[/name]
[name]Olive[/name] [name]Louise[/name]
[name]Pearl[/name] [name]Evangeline[/name]
[name]Magnolia[/name] [name]Kate[/name]
[name]Lilac[/name] [name]Josephine[/name]
[name]Juniper[/name] [name]Chloe[/name]
[name]Lark[/name] [name]Elizabeth[/name]
[name]Briar[/name] [name]Adeline[/name]
[name]Winter[/name] [name]Amelia[/name]
[name]June[/name] [name]Gabriella[/name]
[name]Emerald[/name] [name]Juliet[/name]
[name]Mercy[/name] [name]Annabel[/name]
[name]Sunday[/name] [name]Isabel[/name]
[name]Amaryllis[/name] [name]Paige[/name]
Or some more off-beat names that are less wordy:
[name]Tallulah[/name] [name]Fern[/name]
[name]Isadora[/name] [name]Opal[/name]
[name]Athena[/name] [name]Sage[/name]
[name]Lorelei[/name] [name]Katherine[/name]
[name]Aurora[/name] [name]Belle[/name]
[name]Delilah[/name] [name]Pearl[/name]
[name]Clementine[/name] [name]Elise[/name]
[name]Elodie[/name] [name]Maeve[/name]
[name]Hope[/name] that helps!
I love the pp’s suggestions of [name]Ivy[/name] [name]Sonnet[/name] and [name]Tallulah[/name] [name]Fern[/name]. Here are some other suggestions. All the best!
[name]Fable[/name] [name]Rose[/name] and sister…
[name]Journey[/name] [name]Grace[/name]
[name]Temple[/name] [name]Claire[/name]
Odyssey [name]Wren[/name]
[name]Genesis[/name] [name]Lark[/name]
[name]Galilee[/name] [name]Jane[/name]
[name]Arcadia[/name] [name]Pearl[/name]
[name]Tamsin[/name] [name]Faith[/name]
[name]Larkin[/name] [name]Faye[/name]
[name]Holly[/name] [name]Sage[/name]
[name]Flora[/name] [name]Jean[/name]
[name]Felicity[/name] [name]Hope[/name]
[name]Iris[/name] [name]Joy[/name]
[name]Darcy[/name] [name]Raine[/name]
[name]Saffron[/name] [name]Bay[/name]
[name]Magnolia[/name] [name]Ruth[/name]
[name]Aurora[/name] [name]Fern[/name]
Somerset [name]Dove[/name]
[name]Clover[/name] [name]May[/name]
[name]Cove[/name] [name]Valentine[/name]
[name]Fable[/name] [name]Rose[/name] and:
[name]Lyric[/name] [name]Catherine[/name]
[name]Story[/name] [name]Elizabeth[/name]
[name]Sonnet[/name] [name]Claire[/name]
[name]Serenity[/name] [name]Jane[/name]
[name]Haven[/name] [name]Elise[/name]
[name]Willow[/name] [name]Ruth[/name]
[name]Genesis[/name] [name]Marie[/name]
[name]Juniper[/name] [name]Violet[/name]
[name]Zelda[/name] [name]Pearl[/name]
Good luck!
I already posted with [name]Ivy[/name] [name]Sonnet[/name] and all of that, but re-reading your post and realizing you wanted a more traditional middle name I wanted to suggest [name]Lavender[/name] [name]Eve[/name].