Thank you for responding to my query.Let me answer your questions first:According to the 1920 census, Gene Maddolene Darby was born September 1919 in Oklahoma.I tried to obtain a birth certificate but was unsuccessful. While birth/death records were required to be kept in OK in 1908, they are very sporadic up until 1925-1930. Maddolene's biological father was a vaudeville performer and moved constantly until circa 1922 when he settled in California. He performed all over the eastern half of Oklahoma. His move to CA fits with the time frame when photos of Maddolene cease in the Darby families.
I now have the obit for Hortense Mae (Galbraith) Wiegand.In it, her daughter is listed as Ruth Spade.It may be Ruth was her stepdaughter.Hortense Wiegand is a sister to Edith Merl (Galbraith) Darby Henderson - mother of Maddolene. The obit made no mention of Gene Maddolene Darby Henderson. I have to believe, since Edith & Hortense, lived in Bexar Co, that Hortense's family knew what became of Gene Maddolene.
I have the name spelled Madeline/Maddolene/Marylin E./Mickey from various sources. What I don't know is if Chester Henderson adopted her after the 1930 census.