The answer is: Destroyed the rest of the royal family

2 Ki 11:1 - Athaliah who was intent on taking over the kingdom killed all the royal family except for Joash who was hidden away for six years to keep the royal line alive.

When Athaliah learned of her son Ahaziah's death, she decisively acted to secure her hold on power by wiping out the rest of the royal family. This ruthless ambition was rooted in a strong desire for dominance, showcasing a side of her that was both calculated and dramatic. It’s fascinating to note that Athaliah is often regarded as one of the most infamous figures in biblical history—often referred to as the only female monarch of Judah—but her reign was defined by bloodshed and deceit rather than benevolence.

The dramatic twists of this biblical account are like something out of an intense soap opera! Athaliah's actions set the stage for a gripping narrative involving loyalty, survival, and the fight to uphold a destined lineage. In a somewhat cinematic turn of events, Joash, the sole survivor, was hidden by his aunt Jehosheba in the temple, which not only saved his life but later set off a revolution against his mother's tyranny.

This tale echoes with themes found throughout scripture, including the cycles of monarchy, divine intervention, and the lives threatened by the pursuit of power. Athaliah's end came when she met her fatal judgment outside the palace. Talk about a dramatic fate for one whose story began with a fierce lust for command. Her life serves as a striking reminder of how power can corrupt and lead to chilling consequences—the echoes of her legacy linger as a cautionary tale about the costs of ambition unchecked by moral boundaries.