How can I help my grandmother?

I am from Honduras, and I want to help my grandmother,she is turning 84 this year, since she lost her sight 13 years ago due to glaucoma she´s been really depressed and havent got any better, she has lost mobility of her legs and they are getting curved as well as her back, so walking has become an issue for her. She broke her arm 5 oe 6 years ago, so she lost mobility of her arm too, since she said that she didnt want to make de excersices the doctor said. She lives with my sister, my mom, my grandfather and me, shes got a maid to take care of her as well but ever since she lost her sight she stopped eating her regular food, and she remembers some things but she forgets others. My grandfather takes care of her while we go to school, but when he has to travel, for a month or so, she gets worse, she stops eating or, she doesnt want to do her own things, such as washing her teeth. Sometimes she gets agressive, and she can be mean to us. Recently my grandfather had to travel, so she stays with the maid in the morning until we come from school in the afternoon but when the maid takes her to the bathroom she pushes her self down and wants the maid to carry her, but shes around 145 pounds so shes heavy, she has throwed herself to the fllor on purpuse, she may even break her hip and we talk with her, but she seems not to understand. She barely eats, she just eats 2 or 3 different vegetables for lunch since she says that she doesnt like anything else, she stopped eating meat, fish and chicken. For breakfast she only drinks a cinnabon tea and a small sweet bread. For dinner, she eats a pudin, like a flan, thats it. She says that we are mean to her and acts like a kid, since she is going backwards due to her age, she acts like a 6 year old. We have to force her to eat. We are trying to make her walk, but every time we try she throws herself to the floor and we are just trying to help her. Last time she went to the doctor, they said she was fine, concerning her heart and all that. Since my grandfather left, she doesnt want to leave her room, so she eats in a table that is near her bed. We are trying to help her to get the mobility of her legs back, by walking around the house. Sometimes she talks to herself and says "I cant anymore". What should we do? How can we make her eat? What are the best excersices for her due to her condition? How can we help her?