I'm striking out so far on Walter Smith, but I think I found Valley's mother for you.
"Missouri Marriages, 1750-1920", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:HQP7-JXMM : 18 January 2020), Wiiliam Wenberry and Alice Brown, Dunklin, Missouri, 31 Aug 1887.
Brown was Alice's previous married name, because the 1900 Census lists an Emaline Brown, stepdaughter, born Missouri 1886.
The 1900 Census shows Alice was born in Illinois Oct 1867. Valley also had a brother named Husler Winberry (first name not indexed, spelled Hustler on the image), and I think she's in the 1900 Census as Annie L Windbury, born Apr 1897.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3CX-17Z : accessed 7 August 2020), Allice F Windbury in household of W E, Salem Township Senath & Hollywood villages, Dunklin, Missouri, United States; citing enumeration district (ED) 39, sheet 14B, family 268, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,853.