Theodosia was born in 1860. She was the daughter of Joseph Allen and Barbara Bush. She passed away in 1937.
Sources
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCCF-CPT : 12 August 2017), Dosia A Scrugham in entry for H E Dowden, 1880; citing enumeration district ED 65, sheet 272D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 0412; FHL microfilm 1,254,412.
Original data: National Society, Daughters of the American Revolution. Lineage Books of the Charter Members of the National Society of the Daughters of the American Revolution. Vol. I-CLII (152). Note on Publishing: Since this database represents a compilation of 151 volumes, the years and locations of copyright information varies, according to each volume, i.e. Volume 8 was published in 1899 in Washington, D.C., volume 63 was published in 1923, also in Washington, D.C., and volume 152 was published in 1938, also in Washington, D.C.