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The upshot of this is going to be that she is going to use her law degree to intimidate you in court. It does not sound like she is interested in arriving at the truth, but rather just pushing her weight around. For this reason, it would be best to hire an attorney to defend against the nuisance action, if and when she files it. This is so you do not lose on a procedural technicality.
If you cannot afford to do that, either defend yourself and hope you get a fair judge or consider asking her to help you work a deal with the landlord to move out without penalties for breaking the lease early. Maybe then she will start thinking that a known tenant is better than an unknown one that may arrive to replace you.
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You may be able to find an attorney in your area to further assist you by going to http://www.martindale.com/ or http://www.lawyers.com/.
You can read about nuisance law above.
You can use the emails to impeach her testimony at a court trial.
You can call your neighbors as witnesses to testify on your behalf.
I would ask for a jury trial so that it limits the power of the judge, just in case she has any connections with the court.
Suing for legal cost and frivolous legal actions is handled by filing a motions for sanctions with the court for filing a frivolous pleading.
You can try to file a harassment compliant with the police if you can fit the conduct under the law at the link above.