Her isolated, unedited vocal track has now appeared online
http://theconcourse.deadspin.com/isolated-unedited-vocals-of-mariah-careys-awful-holida-1666529981
Mariah was awful, and I read that she was 3 hours late and the crowd went home, and when she showed up the angry producers told her to go home, but she ended up opening the show still.
I also thought the entire show was terrible! The CMA Country Christmas was a million times better.