I don't know.私は知りません。How did she make this cake?彼女はどのようにこのケーキを作ったの？
それをI don't knowの後にHow did she...何がわからないのかを付け加えれば私は彼女がどうこのケーキを作ったか知りません。となるのでこれを英語にそのまま訳すのI don't know how did she make this cake?となります。
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