Now I know this may sound crazy to many people, but to make sure I wasn't reaching too far I listened to it again and again and again. Every time it was there. I think the easiest way for me to explain this is to break it down for you. Below are the lyrics, as sung by Demi Lovato, and I'll insert my interpretation of how the lyrics speak to me. (I've deleted the repeated lyrics.)
"Let It Go"