What you don't want your daughter to do is to cooperate with the police. She has a Constitutional right to keep her mouth shut and make the state prove that this crime occurred beyond a reasonable doubt. If she goes to the police, she will make a statement which she will sign, and it will come in as a confession and be used against her.
Saying nothing when you are a suspect or a defendant can never hurt you. Speaking to the authorities, unless you are present with a lawyer, can cost her dearly and hamstring her lawyer when he has to clean up the mess she made.
Aggravated harassment is an a misdemeanor and if she wanted to dispose of it, she could likely get it reduced to a straight harassment, which is a violation and not a crime. Here is the section of the NY Penal law for aggravated harassment.
As you can see, the DA will have to prove that her intention was to annoy, threaten, harass or alarm this person. Arguably, the defendant would find these actions very alarming, so it's all the more important that your daughter keep her mouth shut rather than admit to the authorities that she made these calls at all.
If you have made an appointment with the police, break it unless she can show up there with a lawyer (who will probably tell her not to talk to the police at all).