She felt their presence the moment they arrived in the Nine Kingdoms. She couldn't see them in the mirrors, but she knew they were there. There was a sense of danger around them that the Queen didn't like. Her plan had gone wonderfully according to plan, but it could still fall apart. She had control of eight of the nine kingdoms, but the Dwarves were untouchable. There was also that pesky resistance. Some foolish "heroes" think they can destroy all the Queen had worked for.
The Queen remembered all the Queens that came before her. She smiled slyly as she thought about her success where others had failed. The first lost her kingdom to the retched Snow White, then Christine, who was bested by her own daughter. Last was the Queen's own adopted mother, Wendell's downfall. Regrettably that cow, Virginia, killed her, leaving the Queen motherless. Virginia didn't last. She was killed by the Queen's own hand. Killed trying to protect a child.
The little witch deserved it. No one who kills her mother should live. But even with Virginia out of the way it didn't mean others wouldn't come to challenge her. The Queen was used to the tales of old, the tales of the princess destroying the Queen. It wouldn't happen this time. The Queen stood in front of her mirrors summoning her secret patrol and sent them out in search of the two princesses she knew were somewhere in her kingdom.