No, her singing of "I will always love you" is close to but not an absolute copy of Whitney Houston's version. Go to "Youtube" and play Whitney then this and you can see for yourself.
The differences are not errors, just a matter of style.
Regards,
GtG
Sorry, but I’m skeptical. Look at her lips, some of the phrasing and open mouth singing doesn’t match her half-open/fairly closed shape of mouth.
Her stance and breathing don’t match the natural and typical gutoral tension and projection on the louder parts.
She’s VERY good at lip syncing. But not unreasonable to imagine her mirror-singing and listening to this song 5000 times to get it perfect. As a singer I know it’s very doable, given repitition and carefully studying the original mouth/vocal techniques.
Time will tell. I’d be glad to be proven wrong. I love discovered unknown talents.