Princess And The Suffragette by Holly Webb
It is 1913, nine years after the end of A Little Princess saw Sara Crewe escape Miss Minchin's orphanage. Lottie, the smallest girl from the original story, learns about the Suffragette movement from Sara, who returns to visit from time to time. Soon Lottie finds herself sneaking out of the orphanage to attend a demonstration, in defiance of her cold, distant father.
A father who has a secret to hide about her own missing mother... It's a story about lost mothers turning up in unexpected situations, the power of friendship and female empowerment.