How should i make my xbest friend mad she made me mad?

what should i say to her back we got in to a fight yesterday because my grandma just died i told her my grandma just died she said soo who cares and i cryed and said i do then she called me a cry baby i said IM CRYING CAUSE MY GRANDMA DIED and i said well call my whole family a cry baby bec they cryed too then she laughed im only 12 im in 7th grade what do i say back to her? please answer this question thank you.