Ever been to Vegas? Go ahead and admit it.......I will. The slot machines fascinate me - and so do the people sitting at them! You become mesmerized by the spinning fruit. You continue to put money in even with no reward..........because there is always the hope of a reward. If you get 1 prize, you will be motivated to continue trying because there is a chance it will happen again. Sporadic rewards can be very motivating for behavior to be repeated.
Did you know that you can be like a slot machine to your PeeWee? Your random punishment is like the random rewards from a slot machine. It is kind of reverse reward. Your PeeWee is willing to take a chance that you aren't going to discipline her this time - so she continues to do the same behavior.
So actually random punishment, is really a reward. It feeds the excitement of the behavior slot machine, and keeps the PeeWee pulling the arm over and over. If you aren't going to consistently punish bad behavior - don't bother to punish randomly - you are getting the same result either way.
Unplug the slot machine............and become consistent. Do what you say you are going to do every time.
James 5:12 But above all, my brothers, do not swear, either by heaven or by earth or by any other oath, but let your "yes" be yes and your "no" be no, so that you may not fall under condemnation.