And she doesn't remember where and when it was. Not even the year!  So there are 3 possible scenarios: First one is she was drunk not only that night but continued for the next years. This would have affected her memory completly. Second one she wasn't drunk anymore at least a few days later. She would have written down something or there would be events in her life to help her call to mind when it happened. Especially if, as she claims, it was such a dramatic experience for her that changed her life. Everyone would remember the year of such an event! Third: She is lying completely. Pack of lies. For sure this is it. Lock 'er up! Unspecific place and year makes it impossible to find witnesses against the claim. Necessary method because they don't know where he was at a specific day so he could have a foolproof alibi.