My mother had a medical procedure in February 2015 and since then has been living with us. It appears the procedure caused dementia to set in. She is 90 years old. She became so weak that she couldn't function at her home. In the past year she has become so weak that she can't hold her body weight up. We have to hold her in front of the toilet to pull her panties down and then the same when she is finished. She is in a wheelchair constantly since she can't support her weight. She is having currently having physical therapy and I have ordered a home therapy machine which I hope comes in soon. The last few days when she is sitting in her recliner her body starts drifting to one side until she is literally laying on the side of the chair or when eating dinner she has her face in her plate. I am currently feeding her in the evenings when this happens. Is this due to the dementia?