I think they are all fine! Honestly from my experience I actually see lots of sibling sets with repeated sounds even rhyming! Parents get drawn to certain sounds and follow similar patterns. For example a lot of parents having sibling sets with repeated L sounds or repeated E sounds.
Looking at the examples [name_f]Elizabeth[/name_f], [name_f]Eleanor[/name_f], [name_f]Felicity[/name_f] & [name_f]Stella[/name_f] are all fine and I wouldn’t even see the similarities of the L sound but the el start does standout but not overly so especially if you went with different nicknames like [name_f]Libby[/name_f] & [name_f]Elle[/name_f].
With [name_f]Rosalia[/name_f] & [name_f]Cecilia[/name_f] have similarly endings which do standout I would probably switch it up with [name_f]Rosanna[/name_f] & [name_f]Cecilia[/name_f] or [name_f]Rosalia[/name_f] & [name_f]Cecily[/name_f] but it’s not the end of the world. If the parents love these sounds I wouldn’t discourage them for using these names.
[name_f]Elizabeth[/name_f], [name_f]Eleanor[/name_f], [name_f]Genevieve[/name_f] & [name_f]Felicity[/name_f] are absolutely fine. The only thing that standouts is the length but aside from that these four would be pretty together.