(Oregon City, OR)  --  An Oregon City teenager who had been reported missing is now back home with her family.  Officials say 16-year-old Sierra Harper had not been seen since she prepared to go to school Thursday morning.  Police were contacted when the teen failed to return home Thursday afternoon.  Authorities say the girl texted a friend Saturday and reported she was okay, and was found yesterday at a Portland home before she was reunited with her family.