“Oh, for goodness‘ sake,” yawned Isabelle, “Is he really waking us up at this ungodly hour just to prove his love to you or something? Couldn’t he have called? mundane men are such twits.”(Thinking its Simon when the “doorbell” of institute rings)-Isabelle to Clary, pg.188-”

“Anyway, he's [Simon] obviously not here. Go back to what you were doing. What's the point in wasting a perfectly good brick wall when you have someone to throw against it, that's what I always say." And she [Isabelle] stalked off, back toward the bar. - City of Fallen Angels pg 188 hardcover”

“Oh, its big enough,” he said patronizingly, “but somehow I was expecting…you know.” He gestured with his hands, indicating something roughly the size of a house cat.“It’s the Mortal Cup, Jace, not the Mortal Toilet Bowl,” said Isabelle.-Jace & Isabelle, pg.349-”

“Clary widened her eyes, which was good for keeping herself from crying. "Isabelle, can I ask you something?""Sure," said Isabelle, wielding the eyeliner expertly."Is Alec gay?"Isabelle's wrist jerked. The eyeliner skidded, inking a long line of black from the corner of Clary's eye to her hairline. "Oh hell," Isabelle said, putting the pen down.”

“He landed on his back amid a tangled pile of clothes. "Isabelle," Simon protested weakly, "do you really think this is going to make you feel any better?""Trust me," Isabelle said, placing a hand on his chest, just over his unbeating heart. "I feel better already.”

“I think I like ‘mundane’ better than ‘bloodsucker,’” Simon muttered.“With Jace, you don’t really get to choose your insulting nickname.”-Simon and Clary, pg.234-”