Please remove her address from the CC. She is not in charge.
ご質問ありがとうございます。
色々な英訳がありますので、上記に一般的な言い方を提案しています。そして、下記に他の言い方を書いておきます。
例:Please take her address off of the CC. She is not responsible for this.
例:Please remove her address from the CC on the email. She isn't involved with this.
ご参考になれば幸いです。