Fame has a narrative arc.
In this case, it feels like the right story. A woman comes out of nowhere, is embraced by the world for her naive goodness, gets a bit of a swelled head and acts bitchy instead of sweet, and plummets back into the obscurity from which she emerged.
Or not obscurity, really. She will melt into an undreamy life of second-rate fame — with bad records, dull reality show stints, etc.