The shoe is off at 12:03:57 ... the time the dance ended. (Did she fall down during her "dance?")
She left without the shoe at 12:30:12 subsequently falling on the stairs.
The neighbor, Bissey, states she went back for the shoe but never reentered the house.
If she never went back inside the house after 12:30, then we're back to the alleged rape having to happen during the time she was in the bathroom. Where personally I think she was doing her nails and getting high(er).