Our Little Hen Barbara Died Today

Our sweet girl was fine today, running around, and enjoying her yard.  At about 1:30 pm I gave her and Mabel their raisin treats.  She was her piggy little self.  At 4:00pm I went out to put them I their coop and found her dead on the floor.  Her little body was still warm.  There were no signs of trauma, no blood, feathers, nothing.  She was just laying on her side with her little eyes closed.  I picked her up and carried her inside, calling for Cal.   We are heart broken to loose this wonderful gentle funny little hen.  I am so sad. 
We don't know how Mabel will be now that she is without her buddy.  They cruised around the yard together all day long. 
We love you Barbara.