At that age my daughter followed a similar pattern of appearing to be ready, demonstrated by using the potty off and on for a few weeks at a time, and then regressing. We also had poo on the floor once or twice during this timeframe. Very frustrating. But, I realized that she wasn't quite ready, so I did not push it. Instead I just encouraged her to use the potty, while not expecting it. I let her control potty use, and just put her in large diapers/pull-ups/trainers as she was on the larger side too. When she's really ready you will know it and she will use the potty, but don't be surprised if she often still shouts back "No, I don't have to go" while simultaneously doing the potty-dance. There will be accidents, but that too shall pass! My daughter was just over 3 when she was "trained" (just a few accidents now and then due to being distracted/not wanting to stop playing). Now she is 3.5 and we still have the "No, I don't have to go" attitude, but almost no accidents. Hope this helps.