Who does Tuck help at the very end of the story?

Tuck visits the cemetery while Mae is shopping for supplies. He finds the Foster family plot and Winnie's tombstone, which says she had died only two years prior and had been a wife and mother. Tuck is sad, but salutes Winnie, clearly thinking that she has made the right choice. When he meets up with Mae, Tuck explains what has happened to Winnie. She thinks immediately of Jesse, but really, the whole Tuck family knew what Winnie had decided long ago. They head out of Treegap, and swerve to avoid a toad who sits in the middle of the road, acting like it's immortal (in fact, this is the toad that Winnie poured the springwater on so many years before). Behind them drifts the gentle melody of the music box.