I would also set up some protections to counter her attacks and insults. Mother or not, no one has the right to be abusive, and everyone deserves to feel safe and secure. Set up some protections for you and your siblings. Call on a spirit, possibly a mother spirit to protect you. Depending on how old your siblings are, seek help and call the proper authorities if she’s hurting you or them or placing you in danger.
It’s a shame the one person in this world you’re supposed to trust and who is supposed to love you unconditionally is hurting you. I hope things get better.