This song was originally given to another artist named Melissa Mantzoukis. She got 3rd place in German Pop Idol show and her team submitted this song to Greece last year. Because it didn't win the internal selection, her team went for Cyprus, but switched the artist in the process. As for Silia, she's Australian but has Cypriot ancestry, if I remember correctly.
What do you mean you're 19'!? I don't know what you do but I swear I really thought you were 17 or less! In the other hand, in my opinion, Silia looks older then she is, maybe around 21-22.