So she was the killer but suffers from amnesia. If it turns out that she remembers but decided to do nothing, well, let's hope she gets her just desserts. Not necessarily being framed as the actual criminal, just a teensy bit of karma or something along these lines. As for Boy A, he better forget about her and get on with his life. Let's see who is the traitor that leaks info about his whereabouts, it can't be the girl since she didn't know about him meeting Ken.