I saw the show over the weekend and she was coughing on stage, and even blew her nose a couple times whenever she was able to.
Regardless, she still gave a tremendous performance, and if she weren't coughing, i wouldn't have known that she was sick.
However, I know from experience that it's very wise that she's not going to put any more exertion on her voice than she already is with the 8-show week. She could do a lot of damage to her voice by over-singing while sick.
-There's the muddle in the middle. There's the puddle where the poodle did the piddle."