In all of her songs she is autotuned a LOT. Some people can't really hear autotune when it's not used as an effect (like Kanye West) but it's used on most artists. I'm really impressed when I hear an artist that sounds great without autotuning (such as Beyonce, although I'm not a huge fan of hers). The beautiful notes you hear are created by the producer, not the singer - so you should give them the credit!
