I like Indie Matilda or Thea Florence. I don't like Hattie as a standalone. Elsie is cute and goes with either Matilda or Florence imo.
Other ideas. Marnie and:
Annie, Astrid, Agnes, Audrey, Bonnie, Betty, Betsy, Blythe, Cora, Cara, Clara, Cassie, Callie, Carrie, Connie, Cece, Dolly, Dotty, Dulcie, Darrell, Dana, Dinah, Daphne, Delphi, Effie, Evie, Edie, Esme, Elsa, Flora, Frankie, Florrie, Gracie, Georgie, Heidi, Hazel, Inez, Ivy, Iris, Izzy, Jessie, June, July, Judy, Josie, Kate, Lily, Lyddie, Lacey, Nancy, Nellie, Nora, Orla, Opal, Olive, Polly, Peggy, Penny, Posy, Pippi, Pippa, Ruby, Rose, Rosa, Rosie, Romy, Rita, Sadie, Susie, Sylvie, Sukie, Tessa, Tara, Tilly, Una, Veda, Vita, Vivi, Winnie, Willa, Yvette