Wonder Woman is trained in the a variety of martial arts, making her a master of unarmed and armed combat (even proving adept with pistols). Before Flashpoint Batman considered Diana the best melee fighter on the planet, even putting her ahead of Superman, due to the combination of her power and the depth of her training. Even when depowered, she is on par with some of the best hand-to-hand combatants in the DC Universe.
13 years after Slipknot's imprisonment, after examining the photo of Wonder Woman and the Wonder Men taken in 1918 Belgium, Lex Luthor uses facial recognition software to deduce that the great Amazon warrior is in fact still alive, under the alias of "Diana Prince," working at the Louvre Museum, and he obtains footage of Diana in Paris, France, which has her exiting a taxi and entering a shop, in civilian clothing.
Due to the reboot of the character following Crisis on Infinite Earths, numerous things no longer made sense in terms of continuity as it related to the remainder of the DC Universe. As her first overall appearance was now in continuity around the Legends miniseries, it no longer made sense that she was a founding member of the Justice League of America. This founding position was instead given retroactively to Black Canary. Later it was decided that she should be given this position back and thus both she and Black Canary were considered founding members of the Justice League. In reference to the Justice League though, although she has more than 400 combined appearances therein, she has had most of her character development in her own series.
By the end of the war, Diana began to lose faith in both humanity and herself after Ares opened her eyes to humanity's potential for evil. While she still believed in the power of love and compassion to change humanity for the better, Diana was left sobered and emotionally broken over certain events from the war, such as the use of Dr. Poison's gas to massacre the entire village of Veld, and Steve Trevor's self-sacrificing death. After witnessing a "century of horrors", Diana largely stepped away from heroics until she witnessed the seemingly unstoppable Doomsday wreck havoc; ultimately joining in to battle him alongside Batman and Superman. After witnessing Superman's own sacrifice to stop the monster, however, Diana turned once again towards heroics; demonstrating not only her underlying belief in her own core values, but also in the positive effect true heroes can have on the world.
Immortality: Wonder Woman, due to being an Amazon, has lived for millennia without visibly aging, with her being roughly 5000 years old (having been born right after the War of the Gods), and having been present in the "Man's World" since World War I. She is thus the oldest member of the Justice League by far (though still roughly a millenia younger than Enchantress, and even more so than Ares and Steppenwolf), making her an ageless immortal, much like Superman.
A new pantheon of gods has been born! But who are they? Where did they come from? What do they want? All questions for Wonder Woman, because she played more of a role in their arrival than you’d think! Will it fall to Diana to end their existence as well? Meanwhile, Wonder Woman’s brother Jason learns his true purpose. It’s all here in this extra-sized anniversary issue!
Unfortunately, not long after Diana left, Hera came for her vengeance, and though she could not bring herself to kill Hippolyta, she could not forgive her either. Feeling regret at giving up the only real family she had, Wonder Woman returned to Themyscira to find the Amazons absent, and her mother turned to stone. Shortly after, Wonder Woman encountered Lennox, a man who claimed to be another of Zeus' bastard children. After learning that Zeus has gone missing, they confronted the Gods of Olympus, Poseidon and Hades, in order to prevent them from taking over Zeus’ throne. To prevent a war between gods, Diana proposed that the two brothers share Heaven with one ruling during the day, and the other at night. Hera angrily interceded, which was what Diana had planned, and using Hermes' staff she transported herself to Mount Olympus to face Hera alone. She warned that she would make Hera regret what she had done to her mother before returning to Earth. Unfortunately, by the time she had returned, Hades had kidnapped Zola with the warning that Diana would need to make good on her bargain or Zola and her child would die.