From your list, I think these names would go well with your girls.
1 [name]Monet[/name], [name]Mirabelle[/name] and [name]Seraphine[/name] (the French version instead of [name]Seraphina[/name])
2 [name]Monet[/name], [name]Mirabelle[/name] and [name]Vivienne[/name]
3 [name]Monet[/name], [name]Mirabelle[/name] and [name]Madeleine[/name] (if you want all M names)
Honrable Mentions: [name]Odile[/name], [name]Adeline[/name] and [name]Tallulah[/name]
Too matchy in sound and/or look with [name]Monet[/name]: [name]Esme[/name], [name]Maeve[/name], [name]Maisie[/name], [name]Mireille[/name], [name]Violet[/name] and [name]Lisette[/name]
Too matchy in sound with [name]Mirabelle[/name]: [name]Giselle[/name]
Other Suggestions
[name]Monet[/name], [name]Mirabelle[/name] and Mazarine (all French M trio!)
[name]Monet[/name], [name]Mirabelle[/name] and [name]Lorelei[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Saffron[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Clementine[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Magali[/name] (all French M’s)
[name]Monet[/name], [name]Mirabelle[/name] and [name]Daphne[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Dahlia[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Virginie[/name] (French for [name]Virginia[/name])
[name]Monet[/name], [name]Mirabelle[/name] and [name]Emmeline[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Ariane[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Chloe[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Delilah[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Genevieve[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Jasmine[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Zoe[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Amandine[/name]
[name]Monet[/name], [name]Mirabelle[/name] and Léontine
[name]Monet[/name], [name]Mirabelle[/name] and [name]Coraline[/name]
[name]Monet[/name], [name]Mirabelle[/name] and Céleste
[name]Monet[/name], [name]Mirabelle[/name] and [name]Rosalie[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Oriane[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Eulalie[/name]
[name]Monet[/name], [name]Mirabelle[/name] and Régine
[name]Monet[/name], [name]Mirabelle[/name] and [name]Pascale[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Solange[/name]
[name]Monet[/name], [name]Mirabelle[/name] and Ophélie
[name]Monet[/name], [name]Mirabelle[/name] and [name]Fabienne[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Jacinthe[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Marjolaine[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Clotilde[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Sidonie[/name]
[name]Monet[/name], [name]Mirabelle[/name] and Eugénie
[name]Monet[/name], [name]Mirabelle[/name] and [name]Bibiane[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Capucine[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Cerise[/name]
[name]Monet[/name], [name]Mirabelle[/name] and Aurélie
[name]Monet[/name], [name]Mirabelle[/name] and [name]Candide[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Dominique[/name]
[name]Monet[/name], [name]Mirabelle[/name] and [name]Tiphanie[/name]
[name]Monet[/name], [name]Mirabelle[/name] and Véronique
[name]Monet[/name], [name]Mirabelle[/name] and [name]Sandrine[/name]