I have a neighbor who told our ex live in nanny, that just moved out that i told another neighbor my husband & nanny were having anfair. This is a lie

I never old any neighbor this. This lady in my neighborhood has harrased me and now is spreading these lies about my husband when he didn't do anything of the kind. She has been jealous of my family since we moved in. She said what ever it took she would make our lives miserable. It's mentally hurt me and causing conflict between my husband and I. She's giving people in our town awful information that is big true . How do I stop her? She's given me anxiety to the point we have put our house up for sale.