What is the ruling regarding a woman who put poison for her neighbor's chickens after warning her not to damage her crops?

It is not permissible to poison chickens due to the torment it inflicts upon the animal. A barrier could have been made to prevent them, because guarding the crops during the day is the responsibility of their owners. If the chickens damage the crops at night, it is not permissible to kill them; rather, their owner must compensate for the damage. The person who did this must repent and compensate the owner for the chickens.