Remember my question about my mom? Yes it is happening again?

I got up early to go to church this morning like she wanted me to. I even baked brownies for the church meeting afterward. I was trying to put the snacks in the car when she started yelling at me for staying up all night yesterday. It got to the point where i did not feel safe, and ran inside of the house and locked all the doors. She finally calmed down and i got in the car. She was saying how much of a bad, ungreatful child i am. I disagreed. As i said the worst grade i have got so far in school is a b+. She said that a b +still is not an a. I am starting to feel that she is the bad, and ungrateful one. I NEED HELP!