I am now speculating that Dougie Bailey based the character of LITTLE VIC (renamed Christina) BANNON in the novel DEVIL MAKE A THIRD upon his aunt GHASTIE BAKER MILLER. Mrs. T. E. Buntin, who was married to one of Buck Baker's nephews,  made notes in the margins of the 1948 E.P. Dutton and Co. edition. Mrs. Buntin wrote on page 73,"The teacher's name was Ida and Ghastie was named Ida after her and christened later when she was 2 - 3, she was renamed Ghastie."
Page 73 is the end of Chapter 7 in which Buck is caught having an affair with the schoolteacher, Victoria, who his mother had hired to live in her home in Aven while she taught her younger children. After Mrs. Bannon finds out about Buck climbing into the schooteacher's room late at night she fires "Big Vic" and changes her young daughter's name, who was also named Victoria and went by the nickname "Little Vic", to Christina. In 1898 Buck Baker was sued in July by Ida Clark but later on in December of the same year he married her. If this is the "Ida" in Mrs. Buntin's margin note, Ghastie didn't get her name changed to Ida when she was 2 or 3 but when she was fourteen years old.