I don't know if this will help, but will send anyway.
I ran across a Mary Landherr in the 1910 census, b. ca. 1891 in Iowa, father
& mother b. Germany. She was single and lived in the Albert Buckley home in
Longmont, Boulder, Colorado
Could this Mary be Anna's sister? The Buckley family had lived in Nebraska
where some of their children were born.