Kate (Watson) Abbott is listed as 40 yr old widow in 1900 census, Leavenworth co, KS. In 1910 census, she shows up in Jackson co, Mo as Kate Baker and widowed (again?). Presumably, she married a man named Baker, sometime between 1900 & 1910, but I don't know where.
Just taking a guess, she may have moved to Kansas City and then married second husband. Can someone do a marriage lookup and find out who she married and when/where?