You need to reassure her that she can trust you to keep your mouth shut.... I was 20 something once to and my first grow I was so proud I showed a few outside family members.... I regret that to this day..... key is to tell no one....
Yeah, I told my sister that grow because I wanted to show it to someone. Even though I only told my dear little sweet sister, I regret it to this day and would take it back if I could. You really can't tell anyone ideally. You can't even talk about it anymore openly. I even feel a little stupid for putting up as much stuff as I do online.