For the rest of her life that woman will be haunted by what she's done, nothing anyone says or does can make her feel worse, so let's just try to have a heart.
There's no reason to believe this is true. Plenty of people commit horrendous crimes and feel no remorse. Rapists tell themselves that they are the true victim, she shouldn't have led him on, she's an evil bitch for going to the police and ruining his life. People murder their partners and convince themselves that they are the ones who've really suffered, their partner shouldn't have provoked them, they made one mistake and now they're going to have to pay for it for the rest of their lives.
When Tracey Connelly, the mother of baby Peter, went to prison, I remember people saying that she must already torture herself far more than any cellmate ever could. In reality, she got recalled to prison shortly after her release for breaching the terms of her parole by selling pornographic images of herself. She actually tried to cash in on the notoriety of being Baby P's mother.