How do you defeat harley Quinn to top of tower outside?

To defeat Harley Quinn at the top of the tower, focus on dodging her attacks and using your environment to gain the upper hand. Utilize ranged gadgets to keep her at a distance and look for opportunities to counter her when she charges at you. Timing your attacks is crucial, as she can be unpredictable with her movements. Finally, don't forget to use any available cover to avoid her projectiles while planning your next move.