Alma 19:17

thus having been converted to the Lord, never had made it known; therefore when she saw that all the servants of Lamoni had fallen to the earth, and also her mistress, the queen, and the king, and Ammon lay prostrate upon the earth, she knew that it was the power of God; and supposing that this opportunity, by making known unto the people what had happened among them, that by beholding this scene, it would cause them to believe in the power of God, therefore she ran forth from house to house, making it known unto the people;

She had been converted to the Lord but never told anyone. When she saw that all the servants of Lamoni had fallen to the ground, she looked around. The queen and the king and Ammon were lying flat on the ground. She knew this was the power of God. She thought this was a good time to tell the people what had happened. She thought that when they saw this, they would believe in the power of God. So she ran from house to house. She told the people what happened.