Hi there Lynne and thank you for your question,
I will try to assist you with your legal question but please feel free to ask as many follow up questions as you like until you are 100% satisfied.
Yes, your daughter would be able to sue this person for defamation of character if this guy distributes, to third parties, the information which he knows to be wrong and/or false information, and it is this guys intention to harm your daughter's reputation.
Th only defences that this guy would have is that the information is true, or that it amounts to fair comment, or that it has been released for the public's benefit. I don't think that any of these defences would work in this situation.
While your daughter would be able to sue him, the issues would be that she would need to quantify her loses, and if would cost legal fees to actually go to court. To quantify her loses she would be a challenge since she would need to link the harm caused by this guy to her reputation, to an amount of money - and then convince the court that her calculation is correct.
But yes, she could sue for defamation of character!
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Good luck and best regards,