In 1857, the couple attended the meeting between Shadowhunters and Downworlders at the London Institute to ratify the Accords. When the two sides started fighting, she called for scones in an attempt to break the tension.
In 1878, she attended the Council meeting to decide who would replace Charlotte Branwell as the head of the London Institute. Here, she was cornered by two Blackwells, whom she then proceeded to argue with but in her own, German tongue.
Later, the family went to New York to visit the Whitelaws, who ran the local Institute. The Herondales entrusted them with several letters for Magnus Bane, though they never gave them to the warlock.