Sounds like she was either ill, or suffering the effects of drug / alcohol intoxication.

Quoted from MSNBC:

"Houston had been at rehearsals for Clive Davis' pre-Grammy gala and concert Thursday, coaching singers Brandy and Monica, according to a person who was at the event but was not authorized to speak publicly about it. The person said Houston looked disheveled, was sweating profusely and liquor and cigarettes could be smelled on her breath."

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".