tenant subletting on airbnb

[Tom R.]

I was browsing airbnb to try and find our what I could charge for a new house. Imagine my surprise when I discover my house is listed.  I have sent her a communication through airbnb reminding her that subletting is a violation of the lease but for some reason I cant sign up for an airbnb account. After that I'm not sure what else I should do. She has been a model tenant other than this.