She lives with my brother and sister-in-law out of state, and I try to visit often. She has almost pulled us down several times, and our arms & shoulders get very sore after helping her walk, as she's a large/heavy woman. She refuses to use a walker, saying she doesn't need one. I'm afraid we're both going to fall, and be seriously injured. How can we convince her to use her walker? Her knees are not strong enough to support her anymore; it's not a balance problem. She's almost 82.