Disambiguation: Elasti-Girl / Elasti-Woman
First published in: 1963
Rita Farr first appeared as Elasti-Girl in My Greatest Adventure (DC, 1955 series) #80 (June 1963). She married Steve Dayton (Mento) in The Doom Patrol (DC, 1964 series) #104 (June 1966). The couple decided to adopt Garfield Logan (Beast Boy) in The Doom Patrol (DC, 1964 series) #110 (March 1967), and in issue #111 (May 1967) he was officially their son. Rita began using the codename "Elasti-Woman" beginning in Doom Patrol (DC, 2009 series) #1 (October 2009).
Link: https://en.wikipedia.org/wiki/Elasti-Girl