Yea I saw her too. She was great, but I'm going to have to disagree, I believe Dwan is better than her. She's still great, and I wouldn't mind her singing at all, but Dwan has a lot more practice with that song, and a better voice.
That girl was also in for another lead this Monday, and even though she was good, she did not have the practice that the normal girl did. Like for example towards the end of the show she was supposed to hit a high note, but instead of singing the note, she more of screamed it and it was painfully loud. She is a great singer, but the normal people who sing are more experienced with the songs, and she is more prone to mistakes as she does not practice as much. And in the 2 times I've seen her substitute, she has made a couple, not too much, but a couple.
I'm sorry I had to disagree with you, it's just my opinion.