Originally Posted by
nnelson54
Her immediate reaction in the book was to take the Eye of Eternity and use it to augment her powers to make thousands of giant water elementals to crash over Orgrimmar in a wave, flooding it and killing every man, woman and child in the city.
Christie Golden does a good job of explaining her break down in the book. After years and years and years of being the only person in the entire world(it feels to her) fighting for peace between the Horde and Alliance, Garrosh attacks her unprovoked even though Theramore is a neutral city that wants peace with everyone so she can't interfere with his plans to conquer all of Kalimdor. And he doesn't just attack it, he does the Azeroth equivalent of dropping an atomic bomb on it.
She finally cracked, but Thrall(who she ultimately blames for the whole thing, because he's the one who let Garrosh become Warchief) talked her down(after a fight that was pretty uninteresting considering it was between the world's strongest Shaman and the world's strongest Mage) and she agreed to not kill every one in Orgrimmar. And then a couple months later, Garrosh uses her city as an unwitting staging point for an attack on Darnassus. She's just finally snapped and is choosing the side that Garrosh is forcing her to.