We pranked my friends Nana. As her old friend from other town, named Jo.?

It started out as reminiscing, but over five months I gained a personality of a crazy woman, and such, and she notified me and my friend she called the police, and she really is serious and stuff, and so we're nervous. UGH! How much trouble? (Vulgar and MILD threats like, I'm coming over haha were made..!)