Susan Elizabeth Hale 
Emma Oliver and the Song of Creation [EPUB ebook] 

Eleven-year-old Emma doesn’t know that she comes from generations of tree singers, passed from mother to daughter. She doesn’t believe she can sing. Her ailing grandmother has just come to live with the family. Her father is hardly ever at home. Her mother has been acting strange. To add to Emma’s troubles, her mother’s great uncle from England is coming to stay. Then, a strange old woman wearing a hat full of feathers appears mysteriously in her garden. She gives Emma a white swan feather that emits a haunting melody. Emma’s only solace is the oak tree in her garden, which she names Annie Oakley. What she does not yet know is that Annie is part of a network of tree spirits who disguise themselves as old women. These spirits have come to Peachtree City to help Emma remember her mission to sing the Song of Creation and save the Great Mother tree.