I wouldn't classify it as rape unless there was proof. Like a bruise in an odd place or something that gave you an intuition that the night wasn't completely consentual. Hard to say when there is alcohol involved, and with both persons probably drinking heavily, you'd never know if she ever said no... But in my opinion, If the woman feels like she wants to call it rape, then there would only be two reasons. 1. She is ashamed of her actions, for whatever reason, and needs an outlet to explain them. 2. Something happened that was not consentual and she probably wasn't sober enough to stop it.