Yes, she had the lyme disease and was close to die because of it, faith in God helped her to go through such diffficult times. This song represents her overcoming the illness.
I love the song.
Okay, so that explains it. Extreme stress caused by fear of death can often lead to psychological defense mechanisms, by which a person sees no other recourse but to begin bargaining with supernatural elements.
Does this make her a christian singer from now on? We'll see.