She was discovered by Operatives in a magical circle by Operatives were she revealed that Mirk was The Masked Necromancer.
In the heavily edited version of Theater of Shadows found in the newest edition of Armageddon Outta Here, Susie is abducted by Silas Nadir, and is terrified of his blood-crusted pig mask. She is later saved by Valkyrie Cain and Skulduggery Pleasant, but they were all shunted into an alternate dimension and get separated. When Skulduggery and Valkyrie reunite with her, they notice that she looks thin and weak due to the creatures draining her of her life force. She reveals that there is a new being in the dimension, and that he needs their help to return home. But Susie is killed when the all the creatures sting her at once, using her body as a hatching ground for their young.