Thanks for your advice. Actually, I have used the way you mentioned and also use the role play to let her understand. I found she could understand not going to school is wrong. I pretended her and she pretended a teacher. She could do what we wants and also could explain to me in details (e.g. what is wrong & can play with others children). But she just refuse to do so. She holds my leg and cry and don't let me go whenever she goes to school/playgroup. Its hard for me to leave, I am afraid she will lost her faith if I leave her alone.
Thanks for your reply. My daughter will be back to her new school on 3 Sept. Tonight has a 新生家長會, so that I'll try to ask for her teacher's advise in handling the case. Anyway, thank you so much for your advice.