I actually thought she had a pretty good voice. She looked crazy. She sang crazy. But, she had a decent control of her voice.
Not knowing much about her, having only previously seen her perform once before, I looked her up. Apparently, she is a talented song-writer, having written many hit songs for other stars like Brittney, J-Lo, Beyonce, Rihanna, etc.
https://www.youtube.com/watch?v=YV1HvG6ArOU