Crying in school. Understand what to do.

My daughter is 4.3 years old and since 10 June 2019, she has started going to new school in junior Kg. However, while dropping her at school she cries a lot. She dont want to go. She has already did her per schooling in small school, however that time too she use to cry, then after 3-4 months she was ok. But now in this school no other children cry. She has grown up too. After coming home she is very normal. She understands everything. She learns and writes and remember everything. She even remember person face seen only once. Her speech is clear. She expresses everything. Hence I dont understand what is wrong with her. She even tells what all she did in school like which activities etc.. Could you please help me out please. I am really depressed by this. I dont understand what to do.