Deep down she knew her mother was right; logically Rose didn't do anything wrong. Yet, there was this small nagging feeling she had. What if it was her fault...
"I'm not sure, Mum," she said. "What if it wasn't a memory charm? What if it was the Imperius Curse? People never remember what they did and then..."
She was practically shaking at this point. While Rose desperately wanted to help, she was afraid of what she would find out. "Most of the day, I think. I left the castle a little after 10:30 and then it was dark outside."