Can my sister keep my mother from seeing me even though my mother is cognitively sound and has stated she wants to see me?

My mother was recently in the hospital due to experiencing an attack of Generalized Anxiety Disorder. My mother is now recovering. There are 5 siblings who are in conflict with how to care for mom. We have all been doing our part to care for mom. The oldest made the decision to take my mother out of her home and into her home and now will not allow me or another sister to visit my mother even though my mother has stated that she wants to see us.