When was sarabeth by rascal flatts written?

It is based of a high school girl that was diagnosed with a rare for of cancer and the song is meant to express how she felt though this time, unfortunately unlike how the song suggest there was not a happy for the real "Sara" she died 10 mounts later after the news you can found out more here -> Applevalleychurch.org/index.php?option=com_content&task=view&id=150&Itemid=71">http://Applevalleychurch.org/index.php?option=com_content&task=view&id=150&Itemid=71