How to help your kid not to cry when you leave them in school?

I would not tell her it is not right to cry, just reassure her that mommy will be back to pick her up and that she is going to have so much fun with her new friends. She more than likely stops crying within minutes of you leaving.. Build school up to her, talk about her friends, even have play dates with her friends at your home some. You are doing the right thing by taking here there.