For 1910 - 1920 sounding names I would say perhaps -
Edith, Lark, Elsie, Pomona, Phoebe, Phyllis, Emmeline, Seraphim, Elizabeth, Lucy, Linnet, Valerian. Rosalea/lee
Thinking names from books - AS Byatt, E Nesbit and Elizabeth Goudge are all excellent with names of this style. Find a second hand bookshop and see if anything springs out.
Dalilla, Amaryllis, Aster, Fern, Ivy, Jessamine, Lilac, Juniper, Lavender, Lillian, Leilani, Petal, Verbena, Verity is a good one too. Araminta was one of my favourites, but I had a boy!
Josephine?
When is baby girl the second due?