Lose hope, give up, and endure.
Easy to do about anything except MAYBE TURNING INTO A STATUE but impossible to do about THAT because not existing isn't the kind of thing that can be endured.
Fox's Cunning wears off, leaving her feeling vaguely groggy except well aware this is just what being her - enhanced with a headband, even - is normally like and that soon it'll feel normal again.
She hurries back to Keltham's room so she can evade having to explain why she was out.