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I don't think Calla could work well as a honouring name for Carla - the origins are quite different. I'd suggest something like Charlotte, Carlotta or even Andrea (the same meaning).
To me Calla and Lillian are ok. as a siblset, though I'm not personally into soft "l"-names. A lot depends also on the Lillia'ns nickname - Calla and Lia or Calla and Ann would sound fine.