Check the 1930 census. It shows a Mary F. Raley, niece of the head of household, age 12, along with an Annie Raley (age 30, sister of head of household) and Charles Raley (age 9, nephew of head of household). She should appear on the 1920 census with her parents. We can assume her father didn't die prior to 1920, since she has a 9 year old (assumed) brother.
Annie's brother, the head of household, is named James K. Miller.