Story Notes: A/n: In the scene in Dumbledore's office when the DA is being exposed, Kingsley does a Memory Charm on Marietta so she won't spill the beans. We are not told exactly how much damage this charm did - certainly she forgets everything related to the DA and her involvement with it after the first gathering in the Hog's Head - but because it's left vague, I figured I could take some creative license.
Disclaimer: Characters and main story are the property of J.K. Rowling.