[lee martell]

Can you explain what you mean to a non-singer like me?
Are you saying in order to produce the full octave range with the power that she does, one would damage or quickly wear out the voice, the lungs, and the diaphragm?

I recall the late Florence Henderson was rumored to have had ribs removed as a young girl because this would help her singing. I don’t know if that was just an urban myth or what.

[Bethaneidh]

As for range, some of us, myself included and several others I have met, have had three octaves plus since we dropped out of momma. ☺

[Borges]

There is no such thing as a child opera singer. What she’s doing is mimicry that is taxing her vocal folds well beyond what a child’s vocal folds are meant to withstand. People who study singing opera usually don’t get to stuff like Verdi and Puccini until grad school.