Once she's handed over the money, Ginko doesn't take much urging to leave. She backs off, then turns to walk away with a small wave. "I appreciate the, uh... help. Good luck."

As soon as she's out of sight of the playground, she pulls out her phone and opens up her contacts. Whatever she said, she can't leave this alone; these people need help, preferably from trustworthy adults who know what's going on here. Which only leaves her one real option, and that starts with calling Frisk.