Adriana didn't know what to expect when she and Harry went to Hogwarts. New friends, magic, and a strange destiny were only the beginning. There was one thing she knew for sure - this Voldemort dude really screwed her over.
Fred was hit with a Memory Spell during the battle and goes into a coma. The only way to wake him up is to bring up a significant memory from the past. They certainly didn't expect that memory to be about Hermione.