Yeah, the song from Goodbye Lullaby. It's one of my favorite songs from that album. Do you know her earlier albums (Let Go, Under My Skin)?
Wish You Were Here was turned into a short EP consisting of 3 songs (Wish You Were Here, Smile (Acoustic), Wish You Were Here (Acoustic)) as well. I have heard her earlier things. Both sounds work well, but I feel that with the later albums, her voice has been allowed out of the box more and shine more as well.