Well done you for trying so hard to exonerate her. I wonder how proud you'd be if it was your daughter who'd shared a bed for nearly two years with a man she claimed to KNOW was going to murder his family, helped him to rob his family business, sold drugs at her college on his behalf, and defrauded a bank after forging someone else's name on a cheque book. A daughter to be proud of? I think not.
She did not know. She did not believe him. How often are families massacred by their own son/brother/nephew ?
She knew nothing of Jeremy's idea to rob his own family until Jeremy arrived there. Then told her to wait outside.
Susan Battersby's 1984 minor cheque book fraud was brought up in court by the defence. Jeremy would have told them about it.