It has taken a year, but I believe I have found my "missing" grandaunt Laura Wheaton Ackley, born in New York City in 1869. She turned up in the 1930 census, a widowed music teacher living in DeLand City, Volusia County, Florida. Since her birthplace and her parents' birthplaces agree with what I know about my grandaunt, this Laura must be the right one.
Now, does anyone out there know anything about Laura's husband, whose name I do not have, or about any children of hers? I would appreciate any leads.