Because her mother and godfather said that she is the best work her mother has created.
Moreover, her mother and godfather had completely different attitudes towards her and the other two siblings. I feel that Clara was brought out of the world by her mother using a machine to transform into a human being, and her mother had the same eye when she hung up toys. The tearful reaction is also very abnormal.
Otherwise, why only let Clara go to the Kingdom of the Nutcracker, if Clara is a toy, everything makes sense.
My mind may be a bit big, but the more I think about it, the more reasonable it becomes
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