I did tell my closest family members and later close friends about not drinking pretty quickly into my sobriety because I felt that I needed the accountability. Usually my inclination not to say anything, was my AV wanting to leave the backdoor open for me. That being said, I am a true believer that actions speak louder than words. So whatever you decide to do, it really isn't for her, it is for you. She will enjoy your actions if you stay sober and thus, she really doesn't need to hear it from your mouth.