Summer of My German Soldier
Story of the Trapp Family Singers
Cheaper by the Dozen
Catherine Called Birdy
Midwife's Apprentice
They Loved to Laugh

Series:
All of a Kind Family
Five Little Peppers
Misty of Chincoteague/Sea Star/Stormy

Some good suggestions here but I would add Avi (eg True Adventures of Charlotte Doyle).

Time Cat is also good and I’d bet she’d like it— has some of that same travels through history vibe

let her find her own books, either at a bookstore like Politics & Prose on Connecticut Ave or at your nearest library.

The Scarlet Pimpernel. Plenty of schmaltzy but innocent romance thrown in for good measure.

D’Aulaires’ Book of Greek Myths