I think it depends if you want an A name so one “daughter” not left out. If so, I like: Leona, Hestia, Celia, Lucia & Nina. These are A endings but also have some of the softness & “prettiness” of Flora.
I also like Leda, Rhea, and Neva, but choosing one of these might leave Flora stylistically on her own. So if you’re going for these ones, I might tweak Flora to Frida for eg. Actually, I think Flora is the odd name out and taking her out, means you can stick to these more “essential”, strong and simple names. Eg Frida, Una, Petra, Alma & Neva. Reina, Inka & Inga are other names that name that could work if you’re going in that direction.
If you want a non-A ending name in there, I would make at least two have non-A ending. But my approach is for a pretend sibset, you might not care for the purposes of a list.
On that note, perhaps the best thing would be to split your list into two or have two lists - the pretty, literary, Bridgeton names (Beatrix, Louisa, Clara, Willa etc) and the more international and essentialist - which usually have a strong consonant in there (those above, Astrid, Theda, Magda, Vida, Saskia etc). Then you can decide if you want a final list that only draws from one or makes interesting combinations from each, in a balanced selection.
Hope this helps!