GET MORE CHICKENS! Getting attached to one is a very hard loss. Having a loss from a flock is less so, as they come and look to you for food and care and quickly push the thoughts of loss out of the way, caring for those that still follow your motions.
We have had a hard time with yard chickens that have engaged us, made us laugh, and sadly were lost to predation, or 'sudden death' issues. Some just pass for no obvious reason. Doesn't matter. We move forward, and gather the memories.