Do I have a case against someone for slander?

Slander is when someone go around calling you names and slandering your character, it is also called defamation of character. In other words she would need to be defaming you. What you describe is harment. Change your phone number and your husband needs to return to court to either make her pay up through a wage attachment or by her being sent to jail. They do this to the men all the time so where is she so different. Just hang in there and all will be well.