I hate my friend....help?! Plz?!?

Ok, so i got into a fight with my BFF because she was trying to make me feel bad on puropse, so ya. There is this girl who hates me, lets call her "A". A was with my friend the night we got into a fight, so my friend let A text me and be a total ***** to me! My uncle recently passed away, and i get sad about that alot. I told my friend that i am still sad about that and that i hate my life. And she said that it is all my fault my life sucks! She keeps on yelling at me saying i am the worst person in the whole world. I am really sad about it. What do i do? I want to tall my mom the things she said to me, because they were really mean, like she said that I WAS THE WORST BEST FRIEND IN THE WHOLE WORLD AND THAT I AM A JERK! Should i tell my mom, because then my mom will tell her mom and then she will get in trouble, HELP?!