Choices.
We have em. You can make a choice to not include her in your life. Your old enough now.
I no longer allow toxic people to invade my space. My 13 yr old son has made that decision too towards HIS grandmother, who sounds like an identical twin to yours.
He choses to not allow her pessimism, anger, manipualtion invade him. Im sure she blames me,,but oh well.
Choices. We get to make them, not matter HOW much others dont like us for it.