I found the lyrics to the song, and also the original version of the video of the kid singing the song on YouTube. She really is a cute kid! The quality of the sound on the video is not that great but I managed to capture the audio on another YouTube video that had the song accompanying the video.
Here's Amy Castle the cute voice to The Cuppycake Song.
And here's David Choi's acoustic cover version of the song. I think David has a pleasant voice, but I wished I could hear the guitar more clearly though.