Yan hates school

This came as quite a shock to me. Yan, who is usually bubbly and enthusiastic about going to school, is hating school now. She will cry every night and insists she does not want to go to school alone. She wants her jiejie or auntie or me to go with her. She tells me she doesn't like K1 and doesn't like to attend full day session. I am at my wits' end trying to convince her that school is good for her. I hope this is a temporary phase.