I don't think she is cold and I also think that the accusations of her shouting are not very fair either. She has a powerful voice and the songs she has been given require some of the lines to be belted out. Given that there was a lot of discussion of how she was supposed to be struggling with the high notes during rehearsals for Saturday's show, she managed to hit every one of them, and sustain them as well. I daresay it was a difficult song for her to sing, but Kelly should have known that when she chose it. It was written for a strong-voiced soprano, while Amelia is a strong-voiced alto.
There are areas that I would like to see improved, however. If they made her up less heavily and dressed her a bit more demurely, I suspect that she would look a lot prettier. She certainly did while singing alongside Bryan Adams. They seem to be going for the bold, brassy look so far, but perhaps a softer appearance and a much gentler song would work in her favour next Saturday. At least it would demonstrate that she isn't a one trick pony. The other thing that might have cost her votes is the way that she pleads for them when interviewed. I think she says it because she doesn't know what else she can say. Something for her mentor to work on with her, perhaps.
Since Kelly now has three fifths of the remaining contestants, surely it would be in her interests to get all three of them into the final if she can.