I’m looking for a young adult book I read in the early 1990s about a (teen) girl, coming of age mystery. She is sent to live with her aunts, in the American south, or near a desert as vultures or large birds appear. Thought this was a Madeleine L’engle book but doesn’t match those on her site. There is a mystery to uncover, perhaps time involved. It was not contemporary to the 1990s, the characters were dressed more old fashioned, in dresses, but I think automobiles were around.