My 16 year old daughter's former dance teacher, who was always combative and a bit paranoid, seems to have become delusional, accusing my daughter (and two other girls, but primarily my daughter) of having a "pact" to destroy her studio, claiming my daughter is defaming her studio (if you knew my daughter, you'd know how silly this is.). This lady is sending horribly degrading e-mails to my daughter's friends' parents, broadcasting emails about my daughter to all the parents of her students asking for information on her; and worst of all . . she must have Googled my daughter and found she is the president of several clubs at school, and is e-mailing her teachers/advisors at high school saying horrible things about my daughter. Bear in mind, NONE of us has had any contact with this woman in 3 1/2 years! My daughter is a strait A+ student, working on college apps, and is so upset she can't concentrate on school. It also seems to be escalating and that is scary. The police have told this lady that if she bothers our daughter again, she will be arrested. If she continues, what are our options? Thank you in advance.

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State/Country relating to question: Connecticut

Already Tried:
Visited our local police. There were very helpful and calmed my daughter substantially. They have had experience with this lady before. They are going to talk to her and tell her that if she does another action of any kind toward my daughter, she will be arrested. We are (I think) wise, intelligent parents, but this is very foreign to us.