Can pawn shops give your information to other people?

My mom is constantly getting on my ass about shit I sell at the pawn shop. I had an instrument that I never used, she wanted me to give it to her so that she could resell it but instead I took it to a pawn shop. She was calling me getting on my ass about it. Since the ladies are close friends to my mom, they give her information about my transactions. Can they do that?