I don't agree with the "I'm sorry I misjudged you". That implies that it was okay to be rude, laugh at her and roll your eyes if she didn't have the voice she did. I was appalled at the way she was treated, and even by them saying that everyone was laughing at her. I don't see how any apology would work.
I also read that she was having meetings with Sony BMG or something like that. Isn't that Simon's company? I read that along with her incredible voice he was also hearing "Kaching".