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You are not hacking into her accounts if she gave you the passwords and permission to see her communications.
What do you mean by use them against her? If you mean would they be admissible evidence in court, the answer is yes, if they are relevant to the matter before the court, legally obtained and overcome any hearsay objection.
If you mean can you threaten her with them, the answer would be no. That could be a criminal act on your part. You cannot use them to extort her by threatening to have her arrested, even if you can rightfully get her arrested.
If the texts and emails show evidence that she is arranging to have someone hurt you and you wanted to get her arrested for that, however, you wouldn't need to threaten her to use that against her. If you're fearful for your safety, you could report her to the police, show them the evidence and ask that charges be pressed.
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