When I came home from the hospital after open heart surgery, I tried to get out of my bathtub and couldn't! My feet kept slipping. I put a towel on the bottom and that didn't help either. My empathies for her. If they know she does this, why doesn't someone stay with her when she wants to bathe? Surely someone in the family, or a neighbor, could be there to help.
She didn't even want to bathe, she only wanted to soak her tired and sore behind.