Kerstin Hedeby only acted in one role, that of Marianne Gunnar Björnstrand's daughter in Ingmar Bergman's Kvinnodröm (Dreams of Women / Dreams).

She is an artist and also worked as a decorator and costume designer in many theatres throughout Sweden, often for Ingmar Bergman. Some of her costume designs decorated the walls of Bergman's home on the island of Fårö.