In this troper's opinion, Chloe herself is a character who is composed of Crowning Moments of Awesome.
The Summoning: For both figuring Derek's motive for helping her when he clearly doesn't give too much of a damn about her, and then actually confronting Derek and giving him a verbal smackdown for using her as a designated damsel in distress to get Simon to escape Lyle House.
Actually (albeit accidentally) tearing open the earth with her mind in order to raise corpses — with their souls trapped inside. It doubles as High Octane Nightmare Fuel.
Raising Diane's corpse and forcing her to shoot Davidoff.
After getting back from Chloe's lesson, she stands up for Chloe and calls Margaret out on her resentment and stupidity.
When she hacks into Margaret's and Andrew's computers in The Reckoning.