Rita Farr as Negative Girl (Earth-0) - DC Comics

Rita Farr was a famous actress until she was exposed to a strange gas that broke down her cellular structure. She was later saved by Niles Caulder, and joined his Doom Patrol.

Why isn't Hawk Girl mentioned in the Justice League more consistently? Who is she? Does she have a comic or cartoon where she is the main character? - Quora

Elasti-Girl (Rita Farr) - Prime DC Comics Universe - Superhero Database

Justice League VS Doom Patrol (New 52) – Comicnewbies

Negative Girl (disambiguation), DC Database

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Rita Farr (Doom Patrol Shorts), DC Database