Answer:
After the discussion Vinny's parents had with Vinny about the boy who died, it made Vinny to promise her parents that he would stay away from the pond where the boy .
Below is the evidence cited from Lines 112 - 121 of text:
"After the boy drowned, or was taken by the goddess, or whatever happened to him, she said never to come to this pond again. Ever. It was off-limits. Permanently. But not his dad. He said, “You fall off a horse, you get back on, right? Or else you going be scared of it all your life.”
His mother scoffed and waved him off. “Don’t listen to him, Vinny, listen to me. Don’t go there. That pond is haunted.” Which had made his dad laugh.
But Vinny promised he’d stay away."