Unfortunately I think "did not look well" is Hollywood speak for "stoned to the begesus belt."
She has not looked well for some time now. And she seemed to have lost most of her vocal range. She was not he same. Would never have been the same. The Natalie Cole song Miss You Like Crazy should have been a Whitney song. But she was too far gone by then.
And that song was what 1989? If that's true it's kind of amazing Whitney made it this long.