Need opinions

My significant other is 100% involved in my pregnancy. But my mom tries to go to our baby appointments. She already came to our very first ultrasound, so our next ultrasound (for the gender) we wanted to go alone for a special moment together. And decided to do a gender reveal for everybody else. My mom literally threw a fit and now is treating me like the worse daughter in the world. Basically saying I’m taking away HER special moment as a grandma. Basically tossing to the side how I told her I felt about having this moment with my significant other. How should I handle it 🙄😭