Mother-in-law pretends to be in poor health and sick every day. How to treat her?

Mother-in-law is also complaining constantly at ordinary times, and her leg hurts. Her grandson won't help or take it, and she is old and inconvenient to move. When she went to the sixth floor to cook for her daughter's granddaughter's legs, she had the strength to climb and had a great figure. Her daughter is tired of climbing stairs, and neither is she. Let's go. She's fine. Come to me first and say an ugly rude word, as if I were in her way in front. But I didn't know about them at that time, and my children never made her a mother-in-law. Shit, I'm angry when I think about it. What kind of person? It's none of my business that you jumped off a building for your daughter. I didn't know anything beforehand, and I didn't say a word to hinder her. She is so capable, why didn't she just swear to her son? I mean, support her as a daughter-in-law? Too self-righteous, too romantic I can only frame her rude words and take a good look at myself when she comes to see me again one day. We have nothing to do with each other. These are her exact words. Don't come with me.

I am a mother-in-law. I am 54 years old. Knee aches all day, hair is dizzy, or sleepy. I can't get up all day and often have eyes.