It's obvious that she was sick. Her voice was definately hoarse and huskier than usual. However there have been plenty of times when she's knocked this song out of the park so no one should be questioning her singing abilities. Especially since this is a very difficult song to sing(ZENGURU). She belts the ENTIRE song. This song requires power(lots of power) perfect pitch,breath control and stamina. I'd like to hear anyone of her critics deliver it better than she can. This was not a good performance as far as vocals were concerned because Kelly's voice clearly needs rest but I give her props for performing live despite the state she was in. She could have and it probably would have served her better to sing to a backing track or cancelled all together;but if she had lipsynched you all would be talking yang about that and when you've been booked for an appearance or a show a cancellation just does not look good so you should not do it unless you absolutely have to. Kelly is the consumate professional and I'm sure she'll bounce back in no time so long as she takes the time that she needs to get well and be the best that she can be vocally.