A lot of rape victims report it days/weeks/months/years later. What does the time scale have to do with it?
Nothing.
However, there are a lot of holes in the victim's story. Like Erik said, the prosecution argued that she was too drunk to even walk on her own, let alone consent to having sex with someone. But CCTV shows her walking around the reception without help, and she even walked outside to receive a pizza and bring it inside.