My mother has dementia and is 97 years old. My sisters and I rotate caring for her. All but one sister is retired so she does fewer hours. We all know the sister that is working (retiring in 2 months) does not like my mom and resents caring for her but we need her because we are all exhausted. We think she got my mom recently. When my younger sister ran in she did so because she heard my sister yelling st my mom and my mom had her arms up as if protecting herself. What do we do? Tell her never to come back?