My mom is guiltily ne to attend my grandmothers funeral

My grandmother recently passed away. My mom has been trying to guilt me into going to gonto the funeral. We lived with my grandmother for years with my mom and she abused me and my brother so bad. It was physical and sexual. It was more physical with me even though there was some sexual abuse but she severely sexually abused my brother and made me watch.. When we came forward to my mom she told us we can't say anything because then grandma will go to jail. She said to us "Females in prison are animals amd not understanding. They will tear her apart." So we stayed quiet. My brother ended up developing a lot of issues mentally and took his life when he was 17. It was my 14th birthday when he killed himself. I knew he was gonna do it too. Something just tole me he was. And my mom had the AUDACITY to let the women who is the reason he is gone speak at his funeral. I was so fucking mad! My grandmother had a stroke and they had to pull the plug and she died. I didn't even see her at the Hospital. My mom has been calling me for 4 days straight saying how ungrateful I am and her mom gave us a place to stay when we had nothing. When I bring up the abuse she tells me to let it stay in the past. When I bring up my brother she says he's dead now and to let it go. I'm honestly about to block my mother, but I feel like that would make me a terrible daughter. Is it wrong for me not to go to her funeral when she gave us a place to stay?