I love the suggestions of [name_f]Eliza[/name_f], [name_f]Lara[/name_f], [name_f]Clara[/name_f], and [name_f]Matilda[/name_f]. Other than those:
[name_f]Adeline[/name_f]: Obviously very similar to [name_f]Madeline[/name_f], but sidesteps the possibility of the nickname “[name_f]Maddie[/name_f]” if that bothers you.
[name_f]Eleanor[/name_f]: [name_f]Eleanor[/name_f] has the same classic, elegant feel that [name_f]Alice[/name_f] and [name_f]Frances[/name_f] have, and the “nor” sound from [name_f]Noor[/name_f]. I love the idea of sisters named [name_f]Alice[/name_f] and [name_f]Eleanor[/name_f].
[name_u]Eloise[/name_u]: [name_u]Eloise[/name_u] to me sounds like the perfect sister for [name_f]Alice[/name_f] or [name_f]Madeline[/name_f]. It’s a classic, pretty name that reminds me of a children’s book character. It also has the same soft pronunciation as many of the other names on your list.
[name_f]Esme[/name_f]: [name_f]Esme[/name_f] has a lot of the elements of your list: it’s sweet and streamlined like [name_f]Alice[/name_f], [name_f]Sophie[/name_f], [name_u]Wren[/name_u], etc., but also romantic like [name_f]Aurora[/name_f] and exotic like [name_f]Ingrid[/name_f] and [name_f]Noor[/name_f].
[name_f]Eva[/name_f]: [name_f]Eva[/name_f] feels classic and streamlined yet romantic. It has a similar feel to a name like [name_f]Ingrid[/name_f] or [name_f]Aurora[/name_f] in my opinion, recognizable but feels a bit European.
[name_f]Josephine[/name_f]: [name_f]Josephine[/name_f] feels similar to many of the names on your list in that it’s a true classic but still has a lot of character to it. It has the -oph from [name_f]Sophie[/name_f] and a similar -ine ending to [name_f]Madeline[/name_f], even if they’re pronounced differently.
[name_f]Lila[/name_f]: [name_f]Lila[/name_f] is an Arabic name like [name_f]Noor[/name_f] and [name_f]Zara[/name_f], and it has a similar lilting, soft sound to a lot of the other names on your list. It’s also similar in popularity to a lot of these names: somewhere in the top 400 or so, but not in the top 50.
[name_f]Rosalie[/name_f]: [name_f]Rosalie[/name_f] is so sweet and romantic, like many of the names on your list, and I think would sound so perfect with [name_f]Madeline[/name_f], [name_f]Alice[/name_f], or [name_f]Aurora[/name_f].
[name_f]Sylvie[/name_f]: [name_f]Sylvie[/name_f] is a nice alternative to [name_f]Sophie[/name_f]. They’re both [name_m]French[/name_m] versions of recognizable English names with a sweet sound and the -ie ending.