[name_f]Rosemary[/name_f] [name_f][/name_f]- this may be the only [name_f]Rose[/name_f] name I love[name_f][/name_f] (although I like a few others). [name_f][/name_f] I agree she is perfection with [name_f]Susanna[/name_f], and I adore the nn [name_f]Romy[/name_f] (Rosie is sweet too). [name_f][/name_f] She feels cozy and vintage and reminds me of baking in the kitchen with my mom and also feels quite international to me? [name_f][/name_f] Probably because the only one I knew was the secretary at my high school, which was a boarding school and had kids from all over the world who attended. [name_f][/name_f] She feels so versatile with the [name_f]Rose[/name_f] nns, [name_f]Romy[/name_f], and all the off-shoots from [name_f]Mary[/name_f] you could use for a nn as well! [name_f][/name_f] [name_f]Susanna[/name_f] and [name_f]Rosemary[/name_f] is dreamy.
[name_f][/name_f][name_f]Willa[/name_f] [name_f][/name_f]- feels vintage and literary to me; I am admittedly not the hugest [name_f]Willa[/name_f] fan but it is a timeless and I agree it goes well with [name_f]Susanna[/name_f]! [name_f][/name_f] I like some of your other options more with her though.
[name_f][/name_f][name_f]Louisa[/name_f] [name_f][/name_f]- love how literary [name_f]Louisa[/name_f] feels via Alcott; I remember thinking of [name_f]Louisa[/name_f] as this grand and romantic and adventurous name, she feels like the name of composers and adventurers, like the name of a woman who does wonderful and beautiful things that make the world a better place. [name_f][/name_f] [name_f]Lou[/name_f] is so sweet! [name_f][/name_f] I like the option of [name_f]Lulu[/name_f] for a baby too. [name_f][/name_f] I think [name_f]Susanna[/name_f] and [name_f]Louisa[/name_f] are a gorgeous pair.
[name_f][/name_f][name_f]Theodora[/name_f] [name_f][/name_f]- it’s always felt like an obvious feminization to me (and I’ve never been a fan of those), so I’m one of the few berries who don’t love it. [name_f][/name_f] I do think [name_f]Thea[/name_f] is absolutely beautiful, but would prefer just [name_f]Thea[/name_f] with [name_f]Susanna[/name_f]. [name_f][/name_f] It does have a beautiful meaning, though, and [name_m]Teddie[/name_m] on a girl is a GP for me.
[name_f][/name_f][name_f]Dahlia[/name_f] [name_f][/name_f]- beautiful floral name! [name_f][/name_f] I don’t appreciate it enough but I think it’s so underrated. [name_f][/name_f] [name_f]Dolly[/name_f] is super cute! [name_f][/name_f] I think [name_f]Zinnia[/name_f], [name_f]Camellia[/name_f], [name_f]Wisteria[/name_f], [name_f]Marigold[/name_f], [name_f]Jonquil[/name_f], [name_m]Larkspur[/name_m] feel like similar floral names if you’re wanting other options [name_f][/name_f]- they don’t have [name_f]Dolly[/name_f], although I think you could pull [name_f]Dolly[/name_f] from [name_f]Marigold[/name_f] too! [name_f][/name_f] I like all of them with [name_f]Susanna[/name_f]. [name_f][/name_f] 
A few other random ideas:
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Viola[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Mercy[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Guinevere[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Edith[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Clemency[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Delphine[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Adela[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Magdalen[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Katharina[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Leonore[/name_f]
[name_f][/name_f][name_f]Susanna[/name_f] & [name_f]Felicity[/name_f]
Good luck!