What to do

We have been using the process for three weeks. Our daughter who is 13 years old, has ADHD and in the beginning was doing really well with the process. But lately she has started to push back. It has become very difficult for her to just say okay and move on or accept consequences. We patiently and calmly go thru the steps and try to help her stay calm. But she just continues to push back harder and harder. Until we go into the rule of 3. Even when we get to this part of the process she continues to push back until we are at a 24hr loss of privileges. Do we continue to follow the process or are we missing something?