Gotham Uprising is a story I came up with for a Batman Elseworld. Its based on the Dark Knight Returns...I will share more info about the storyline soon!
Since Black Mask's company (although they could be looked at as a gang) has taken over Gotham,Ivy has taken over the park again. She is slowly dying due to the toxins inside her body and the only serum that can help her is produced by Black Mask. So in return for the serum Ivy supplies Black Mask's company with the produce she grows in the park. She lives with her own "army" of people she has injected to be like her. She is no longer friends with Harley Quinn and has hatred towards her due to Harley foolishly always going back to Joker.