Nothing in this email constitutes defamation, and it is likely that the small claims court will recognize that and decide the case accordingly. But, that said, this is not an appropriate or effective manner in which to be managing your family problems. Don't be surprised if the court is less than respectful of your conduct here, and you should definitely re-think and find better strategies.
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Based on the information you have provided, it is very highly unlikely that she will be able to establish defamation.