Is it a case to make my sister not pushing and manipulate my mom selling a house and moving out of state with her?

My mom lives at a house under my sister's name. My sister and I are not on speaking terms due to her manipulating my mother constantly by soft talking to her, talk bad about me by assuming all bad things about me which I never thought about, and always playing the victim. My mother is always taking her side because she always feels sorry for her because she is bipolar disorder. Now, due to I left not talking to her anymore she was mad and try to sell the house and push my mom to move to another state with her. My mom was depressed do not want to go but she has no choice because she is very afraid of her and finally she has to go. Is there a case to stop her pushing my mom to move to her house to another state?