Small claims court......................?

I live in Tennessee. I was harred by this girl non-stop for days, she wrote slander about me all over the internet, and I finally had to call Verizon and have her blocked. I did nothing to her (I quit a job and my reasons for quitting weren't to HER standards). In any event, she was helping me out, and I told her I'd pay her $40 a week for 2 hrs a day, 3x's a week. It only ended up that she helped me 2x's a week. SO I paid her $40 for an entire 2 weeks (since she was only helping 2x's a week instead of 3x's). Now she says I owe her another $40... yet she actually owes me AND my husband money. She went as far as to say it was $60 (which is flat out ridicilous). I don't owe her the extra $40, she wasn't helping me as much as we initally agreed, so why should I pay her for help that she didn't do? She told me if I don't pay her by May 13th that I will be hearing from her lawyer and will get sued. Over $40? A lawyer will cost her more than that. What is the point? She said she will ruin my life... etc. Is there a minimum to go to small claims court in Tennessee? I think this is all a bit childish. I don't owe her a penny, she got paid for her work, and I'm not paying her for work that she didn't do. I qouted her $40 per week for 3x's a week and she only did it 2x's a week. Should I just not worry about this or should I think about getting a lawyer (which i think is extreme)?