My three year old sleep quite well in the afternoon at home, but does not sleep in the day care, perhaps due to so many kids being around. How can I help her sleep again?

Kids catch up very quickly and they know what they should be doing when. As your child is in the daycare, there is little that you can do. I had the same problem with my daughter and she really gets cranky if she does not take her afternoon nap. But slowly after she settled down and became friends with everyone she started napping again. Perhaps your child would also learn. You can perhaps make a request at the day care centre and ask them to help you out. I did this and it really helped me :)