You were Joker's therapist but ended up falling in love with him and went insane like him. But one day, you were both on the loose and Batman was following you and Joker drove into a sea even though he knew you couldn't swim. He left you there and you only survived because Batman helped you out of the water while you were unconscious. You then got put in prison.
You were forced to become part of the 'Suicide Squad' with other villains. The group split up and you were alone with some soldiers who were there to make sure you or the other villains didn't disobey.
You were on top of a building with those soldiers when a helicopter flew there and the soldiers thought at first the helicopter was for them, but then they realized that someone who was originally on their side was forced to help Joker and Joker and his people started shooting the people. You immediately ran behind something and hid to make sure he didn't accidentally hit you. Every soldier got shot in the head when the shooting stopped. Joker got off the helicopter and walked there where you were hiding and he found you sitting on the ground.