may be you try to talk to your daughter. Is the school far away from your home?? Also does she has any friends in Kindergarten? Is the kindergarten has too much homework???try too understand more from her kindergarten and talk to her.......
if she is only for Nursey....then you can just let her to join playgroup instead of nursey. Did the teacher call you?? Is possible try to talk to teacher (may be you can tell teacher whether your kid can bring a small soft toy to school At least she doesn't feel lonely ). I guess if your kid can feel that teacher cares her then she will feel better. Try to talk to your kid after school. But don't keep on asking what you have done today.....may be find some story books related to school and let her know school is fun:)
um....i guess you need to give more support and encourage to your daugther. It doesn't matter whether she is a big girl or small girl. As you know if kid lost the interested to school.......or feel too stress about schooling ......she may get night mare or others misbehaviour........ may be the nursey programme is it too much for her?? What is the class size??.....try to understand more your daughter and the school life!! Add oil!!