When Harley died she didn't expect to stay on the Earth. She didn't expect to be fighting a battle against the demons of Hell, and she didn't expect to be recruiting other souls to help her fight.
"Thought you could run from me?"
"I knew I couldn't."
"I'm glad you found me, but I also hate that you did."
"The only way you'll escape from me this time is if one of us dies."
"Then one of us must, today."