The First Wonder Girl (1965-1984)
Donna's earliest years were spent as an integral part of the Teen Titans alongside Robin, Speedy, Kid Flash, and Aqualad. In this era, it was revealed she had once been a normal human girl whom Wonder Woman had saved from a fire in which her family was killed. Not wanting to see the infant orphaned, Diana took her to Themyscira, where she was trained to be an Amazon warrior. The Amazons used their technology to empower Donna, giving her abiilties like those of Diana, and she was raised as Wonder Woman's adoptive little sister.
Eventually, Donna and the rest of her young Titans teammates grew up, continuing to function as Super Heroes. During this time, she and Robin set out to uncover more information about her birth parents, and they learned that, prior to her rescue by Wonder Woman, Donna had been the victim of a child-selling underground network (NEW TEEN TITANS #38, 1984). Around this time, Donna met and fell in love with Professor Terry Long and the two married (TALES OF THE NEW TEEN TITANS #50, 1985).
Troia and Darkstar (CRISIS ON INFINITE EARTHS, THE NEW TEEN TITANS 1985-1997)
Following the continuity-altering events of CRISIS ON INFINITE EARTHS, Donna's origin story was reimagined. The memories she had of her adoption by the Amazons were said to be false. Instead she had been rescued by the Titans of Myth, a group of cosmic entities who raised her and then erased her memories of them, sending her to Earth to be reawakened when the time was right (NEW TITANS #50-54, 1989).
Following this revelation, Donna chose a new code name, Troia, as well as a new costume.
Donna later learned she was pregnant with a son, but also that his birth would trigger a horrific, cosmic event, turning him into a being known as Lord Chaos. In order to circumvent this fate for her unborn child, Donna agreed to give up the powers given to her by the Titans of Myth and become human (NEW TITANS #92, 1992). Her sacrifice saved her son, but left her powerless.
Seeking a way to continue as a Super Hero, Donna joined the Darkstars, an intergalactic organization of law enforcers, in which she operated under the name "Darkstar." But the change put pressure on her marriage, and she and her husband Terry wound up divorcing. Tragically, both Terry and her son were killed in a car accident not long after (WONDER WOMAN #121, 1997).
Dark Angel (1998-2006)
In 1998, Donna's origin story was altered yet again. It was revealed she was not a normal human girl who had been rescued by Wonder Woman or the Titans of Myth, but instead a clay figure enchanted to life by an Amazonian sorceress to be a companion and sister to Diana.
Unfortunately, as a near identical doppelganger to Diana, Donna was mistakenly kidnapped by a villain named Dark Angel. Upon realizing her mistake, Dark Angel forced Donna to live through an endlessly fragmented cascade of her possible lives. As each "life" ended and restarted, Donna would forget all details of the experience she had just lived, but retain the emotional weight of the suffering she had endured. She was freed from this cycle of death and rebirth by Diana, Hippolyta, and her former Titans teammate Wally West.
Soon after, Donna was killed in an attack by a Superman android controlled by a rogue Brainiac program (TITANS/YOUNG JUSTICE: GRADUATION DAY, 2003). She was resurrected in 2006's THE RETURN OF DONNA TROY.
Returning to the Titans (2006-2011)
Following her resurrection and the events of 2006's INFINITE CRISIS, Donna temporarily assumed the mantle of Wonder Woman after Diana stepped down. She remained in the role through 2006's "One Year Later" time-skip storyline, but later rejoined her Titans teammates in her more familiar role when they chose to reform (in 2008's TITANS vol. 2).
During the COUNTDOWN TO FINAL CRISIS (2007), Donna partnered with fellow recently resurrected Super Hero Jason Todd to search the micro-verse for the missing Ray Palmer.
Donna remained a Titan until the aftermath of FINAL CRISIS, when Wonder Woman offered her a position on the Justice League of America, in which she stayed until 2011's FLASHPOINT event.
The New 52 (2011-2016)
Following 2011's FLASHPOINT, Donna's history was reimagined once again. In this version of events, she was a magically empowered clay figure created by an Amazonian sorceress to be used as a weapon against Wonder Woman.
Much like the first version of her origin story, Donna retained no memory of her actual past. Instead, she was given false memories of being a human girl raised on Themyscira to shield her from the truth.
Despite this, Donna still came into conflict with Diana when they were forced to fight one another over the destiny and social politics of Themyscira, specifically whether or not the island should allow men (WONDER WOMAN #39, 2015).
Later, Donna reconnected with her Titans teammates during 2016's TITANS HUNT, when she learned that her past as Wonder Girl -- along with the memories of all of her teammates -- had been dramatically altered by the evil Mister Twister.
Following the Titans reformation and the subsequent recovery of their memories, Donna decided to remain with her team, re-learning the past that had been hidden from her by both the Amazons and the machinations of Mister Twister.