Ela sabe das previsões de Min, como DavidH diz em a questão relacionada ligada nos comentários:
Moiraine knew Thom would survive Tanchico because Min told her they would marry in The Eye of the World in Baerlon. This is also how she knew he had survived the fade in White Bridge.
Veremos se consigo encontrar a citação exata do livro.
"Min? She saw something about Thom?" "She saw a great deal," Moiraine said wryly. "About all of you. I wish I could understand half of what she saw, but even she does not. Old barriers fail. But whether what Min does is old or new, she sees true. Your fates are bound together. Thom Merrilin's, too." WoT-EoTW chapter 45