That is totally normal. Your child is entering a new phase. There is a reason why it's called the terrible twos. Rest assured that it will get better. You need to continue being their guide gently. Be firm about rules implaced. If she can behave in school, which most kids do. But it's different at home as all attention is focused on them. So they know! Continue having a routine, consistent and be firm.
21 months is a stage where they start going into the terrible twos stage. Its also a stage where they learnt to be more independent and have a mind of their own. You have to be firm with her. It could be that in school,she have to go through rules. Back home, she tries to go thru things her way. Hang in there. and be very firm in your words.
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