Have Fun Storming the Castle! (tag you know who you all are)
Dinah wasn't a huge fan of calling people for help, but she knew that taking on the Joker alone or even with a group of two or three was far too dangerous. She wasn't going to risk everyone getting hurt, or worse because she was too proud to ask for help.
So, she pulled out her phone and began to go down the list of those that she would call for help. There was Fred, and Dean, who had already been helping. Alfred, who could get a message to Bruce for her, since she'd had yet to actually see or talk to Bruce outside of the suit. Even Oliver. While she wasn't entirely sure about asking him for help, they had become allies here, and if he was anything like the Oliver she knew, he'd want to help.
The only person she left out of things was Barbara. She felt guilty, and she'd done her best to avoid the Clocktower apartment that day, but she didn't want Barbara anywhere near the Joker. Or Jake, for that matter. She had a feeling that the presence of a younger version of Barbara would just be a trigger for Jake and she had no idea what the City's Joker would do if he knew that Batgirl was in town and still had the use of her legs.