Mary Alice Prentice Huntington was the estranged wife of Henry Edwards Huntington (1850-1927). She spent several summers between 1901-1906 living in the San Francisco Bay Area with the Huntington children.
From the description of Autograph letter signed by Mary Alice Prentice Huntington to "My dear cousin," 1905 Aug. 3. (Huntington Library, Art Collections & Botanical Gardens). WorldCat record id: 122560014