Just relax your throat. For practice stick your thumbs under your chin and talk in a high voice. You should feel that muscle completely relaxed. It will help you with higher notes. You have a great voice, and I love this song. Thanks for posting!
Very very good interpetation of this song. I really liked it. Just a little advice, I think you aren't using your head voice enough on your belt. I may just be a dumbass. But it sounds great, I really like it and would very much like to download it!
Not Sierra. But an interesting rendition nonetheless.