(Longview, WA)  --  A 12-year-old girl is lucky to be alive after escaping a mobile fire in Longview.  Fire officials say the girl was the only person home when the fire started Saturday morning.  She was asleep in a bedroom when the fire started in the kitchen.  The girl escaped through a bedroom window.  Several pets escaped or were rescued, but one cat died.  The cause of the fire remains under investigation.