I agree that she had to do whats best even the method of killing chicks is not the greatest but easier done and its quick. I have done the same thing and same method of killing chicks a time or two and believe me, they were gone quick. Better than dumping them in a pail of water.....and its not easy to behead a chick that small either without taking your fingers off if you are holding it down.
Whatever method is best for one may not be best for another but basic line is, it was quick and straight to the point and no suffering..isnt that what we wanted?????