She had no real way of doing that, and while she didn't know what was going on, she knew that it was a critical issue and that the survival of Ardenweald is important to the greater universe. She also didn't do it lightly, and even without it, her "favorite children" would likely still have been dead.
What, setting entire zones on fire, killing indiscriminately, blood sacrifices and all that don't count to you? I think you're missing a lot of Old God lore. Remember that N'zoth was also behind Cataclysm, with Deathwing as one of his pawns. And that's the modern, weakened and at the time still imprisoned Old Gods, not when they were at the height of their power.