"Vicky" stops by the doctor's apartment on her way to meet a friend, in order to show the doctor "what she really looks like" when she's all dressed up. The scene cuts to a few hours later with Vicky still at the apartment, drawing portraits for the doctor--the date with her friend apparently forgotten.
Despite the statement at the film's end, Sybil's artwork was never hidden away and only rediscovered after her death. Though never successful as an artist during her lifetime, for many years she had small exhibits of her work in local galleries under her real name of Shirley A. Mason, and she frequently painted commissioned works for friends. These include some of the pieces reproduced at the end of the film.
In the phone box, Sybil drops her change purse. The camera follows the purse to the floor, where is a sound of falling coins, but there are no spilled coins and the purse appears to be still latched.