Girl Has Auto-Tuned Sounding Voice; She Sings Rihanna’s ‘Stay”

Her name is Emma Robinson and she has gone viral. Why? Most people think her voice sounds Auto-tuned. The thing is. She isn't using auto-tune in the video. Her voice is naturally that way. At least, that's what peeps are saying. What do you think? Does her voice sounds naturally auto-tuned? Or, maybe she just has that natural 'chipmunk' sound! LOL