A girl lives in an old house. Her mother is a servant there. The old nursery closet has measurements for growth from the children who used to live there. The girls can travel back in time to play with the children. She gets injured and stops growing in the past time. She also solves a mystery of a lost and valuable book hidden in a tree trunk.
Could be Jessamy by Barbara Sleigh.
This is “Jessamy” by Barbara Sleigh, one of my favorite timeslip books. (Jessamy is actually an orphan staying with an aunt; when she slips into the past via the nursery closet, she takes over the life of another Jessamy whose aunt is cook-housekeeper.)
Thank you so much.
I adored this book as a child and now my daughters can read it
Karen
Yes, “Jessamy” would be my guess, as well.