Tenant making threats

[Tobey Porter]

Long story short, I have a tenant at a property in Ohio who is unhappy with how another tenant is parking.  My property manager has spoken with both tenants and tried to fix the situation.  In the midst of a profanity-laced tirade yesterday, the unhappy tenant said, "if you do not do something prepare to have this get a lot worse".  She also claimed she will hold onto her rent until the situation is resolved.  Her lease is up and she is on a month-to-month agreement now.  Any advice on how to delicately deal with this would be appreciated?  Our fear is when we go to evict her, she will tear the apartment up.  Any recourse to that if it does happen?

Thanks in advance.