I think its just she had a bit more on her late last year over her not having her heart in it. + her having a serious chest infection.
Future classics tv version of I am was worse, vocal wise than this whole tours vocals. I think the dvd will be fine
And her voice always goes like this when she over works. When TA tour was announced, everyone praised that but it cost her CDL vocals.
She just needs some rest
Example of her voice sounding as tired in her 10th anniversary period
http://youtu.be/AeVZ4bDgdZ8