Yeah, Shania is a fantastic songstress, and a smokin' hot beauty to boot!
What you're hearing in her voice is a slight nasal drive which resonates at tones similar to what we hear from electronic devices. Most voice coaches try to work that out of their students because for most people, a nasal sound isn't comfortable to listen to. But a few vocalists can and have made it part of their vocal persona successfully.
“Liberalism is totalitarianism with a human face” - Thomas Sowell
“What "multiculturalism" boils down to is that you can praise any culture in the world except Western culture - and you cannot blame any culture in the world except Western culture” - Thomas Sowell