see i would be mean...
i would put a padlock on the gate and a sign saying no trespassing.
then next time i see her i would say somehting along the lines of "have you had anyone sneaking around your house the past few days?! cause we noticed someones been in our yard when were not home so we've had to put a padlock on the gate. shame realy" and see what she says/does, if no reaction assume she feels no guilt and keep the padlock on.
if she apologizes explain that you felt a little violated by this intrusion that is your property and its just plain rude and that you would be happy to give her directions to the local home depot/ect so they can buy their own fence for their dog.
i would put a padlock on the gate and a sign saying no trespassing.
then next time i see her i would say somehting along the lines of "have you had anyone sneaking around your house the past few days?! cause we noticed someones been in our yard when were not home so we've had to put a padlock on the gate. shame realy" and see what she says/does, if no reaction assume she feels no guilt and keep the padlock on.
if she apologizes explain that you felt a little violated by this intrusion that is your property and its just plain rude and that you would be happy to give her directions to the local home depot/ect so they can buy their own fence for their dog.