We have the same problem with our 3 1/2 yo son. I even called his doctor to get advice, because he would hold it 6 days! We give him fiber fiber fiber FIBER, and lay off the milk and cheese. We give our son dried prunes too. He likes them. Make a routine of making him sit on the potty at the same times every day, no matter what. I have tried giving him a little Miralax in his juice, and he also eats fiber gummies every day. If it gets past 3-4 four days, I give him a glycerin suppository. He HATES that, but it works every time. Sometimes all I have to do is threaten to give him the "medicine in his bottom" and he'll go. I have learned in the last few months that you have to actively maintain it, or it gets out of hand. I wasn't paying attention to how long it had been since he last went, and I would be shocked when I realized it had been so many days. Maybe the daycare can work with you on making a routine for her and making sure she is comfortable going there, ie enough privacy and time. Good luck!!