How to get my mom to be proud of me?

I am usually an A student, and my lowest grades ar B’s. Recently, I have this really hard teacher and everyone fails her class. I failed her quiz, as well as 9 other kids. Then I got a C+ and my mom is thinking of calling the school, teacher, principal, and NO ONE does that!! I’ll seem like a nub, and plus what will she say? I already have a tutor, I want her to calm down becuase she tells everyone and it gets embarassing!!