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I'm sorry to hear this.
No, this has nothing to do with your privacy rights. They are not taking private information from you. They are asking for information that she has. If she participated in the text messaging or emails she has every right and possibly every obligation to produce all those communications.
when she received any email or text message she is essentially owner of that message.
I know this is not what you wanted to hear and I'm sorry that you may find yourself in a difficult situation because of this but this is the correct and accurate answer.