The pal and other friends said the woman and Bryant had gotten together before that fateful night, June 30 - when the teen gave the L.A. Lakers All-Star a personal "tour" of the resort near Vail.
Bryant was polite - even shy - as they walked around the Lodge & Spa at Cordillera, her friends told Fox News.
Later that night, Bryant asked the teenager to personally bring him the room service he ordered, the woman reportedly told her friends.
But when she arrived at his room, the basketball star "suddenly went crazy," one of her friends told Fox.
Bryant "snapped" and "acted like a whole different person," the friend said.
The alleged victim claims Bryant then forced her to have sex with him.