i'm pure at heart, it repels the dirt

All Isabelle had wanted to do was sleep off all of the previous night's woes. So, of course she'd been dragged out of bed in the middle of the night by Clary and Jace who'd absolutely had to tell everyone about the former's realization about where the Mortal Cup was, and how they had to plan to go and get them despite the fact that the search was supposed to be in the hands of the Clave now. Not that Isabelle actually objected. She needed to do something heroic and potentially dangerous to live down the humiliation of last night. Besides, Clary and Jace were right. If the Cup really was with Clary's witch neighbor, the keeper of the Sanctuary, they had a much better chance of getting it from her than the Clave.

( Wheee the Mortal Cup. )

[ooc: NFB, tbc in the comments. Summarized from City of Bones.]