The first of the DP to share her story, Rita is essentially givent the third degree - placed under a spotlight to share her tale of woe.
Rita was filming a scene with a crocodile (I bet she'd appreciate modern CGI) and declared the only way to avoid the hungry croc was to plunge over the edge of a raging waterfall. Turns out she was right. The croc, being no dummy, turns away, but Rita falls. The rest of the origin lies below for your perusal.
Poor, poor distraught Rita Farr. Cursed with the "terrible" power of growing larger or smaller, she walked away from a promising movie career. Good news for the readers, though, as she became the heart of the Doom Patrol.