Title: The Tune Is In The Tree
Description: from Goodreads:  Annie Jo was a little girl like any other little girl. She was just about as big, too, as any other little girl her age. She had pigtails and for best occasions a plaid silk dress. Her father was an aviator (so the birds had a special feeling for him), and when he was delayed one day, and her mother went to hunt for him, and Mrs. Bunch, the sitter, sprained her ankle, the birds took charge of Annie Jo.Miss Ruby, the hummingbird, who understood magic, made her two and a half inches high. She learned to fly and visited the Robins, the Warblers, and the Thrushes. The perfidious Mrs. Cowbird was causing trouble as usual, laying her eggs in other birds' nests. (Mrs. Cowbird is a notable villainness.) And Annie Jo lost her plaid silk dress in a very curious way. But she got another one in time for Mrs. Oriole's ball, which occurred on the day Annie Jo returned to her normal size and home.