You should immediately and privately discuss this matter with an attorney. An attorney can assist you.
Also, you should consider contacting the police regarding telecommunications harassment occurring.
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If you tell her not to contact you at all she could be violating the Telecom Harassment statute which states in 2917.21(A)(5) that no person shall make a telecommunication that knowingly makes the telecommunication to the recipient of the telecommunication, to another person at the premises to which the telecommunication is made, or to those premises, and the recipient or another person at those premises previously has told the caller not to make a telecommunication to those premises or to any persons at those premises.
This is a first degree misdemeanor, so punishable by up to 6 months in jail and/or a $1,000 fine. If the person is charged with that, it may be possible to get a temporary protection order from the court.
If you want a civil protection order, you may fill out the application for such by obtaining one form your local common pleas court. However, there are standards you have to meet that will require a hearing. I would suggest obtaining an attorney for a civil protection order.