You're so determined the woman is right you missed the point. Either she's lying about the rape or she's lying when she said she's lying about the rape.
This is not about the woman being "right". She was raped. She did not lie about the rape. She was bullied (the verdict of the outside investigation by a police officer) into retracting her accusation. If they had followed well-established procedure, there would have been no reason for her to retract anything, and this incredibly traumatic experience for her (on top of the actual rape) and damning incident for the police would have been avoided.
Someone who has been traumatized might easily be intimidated by the police to withdraw an accusation if he or she is threatened with jail time. The point which should be obvious to anyone with a moral conscience, is that she should not have been bullied. In your kneejerk zeal to defend the police, you are blaming an actual victim of rape for failing to stand up to police mistreatment and bullying. Your position is morally repugnant.