Dear A.,
You just described a pretty normal older woman. We think we know everything because we have been through a lot of living, in the time when the living was not so easy as it is today. Also she probably has senile dementia - just regular old age brain working. She probably had a lot of responsibility during her life. She is just being the product of her life and her reaction to it. If she does not go out without someone it is because she feels uncomfortable doing that. I joke that I am getting to that point, and sometimes if I am feeling insecure, I will ask my husband to drive me here and there.
It is a different feeling and different world that you are in when you are elderly, and sick! My daughter moved far away and suddenly I was scared because I was ill for a period of time. I am feel o.k. now and less insecure, so that is the way of life for older people. My husband just gripes about his aches and pains, and I laugh and say what do you expect at 81 years old. He still wants to be the big handsome lover and decision maker of the world. In actuality, he can't even figure out how to get a soda at Taco Bell. He came away with a lot of syrup on the top if his hand and wondered how that got there. It is a whoooole big changing world.
Now, keep going up to your room if you want, that is just wanting to be quiet and not talk or caregive for a while. Just find things to do during her week with you - like take her and the baby to the park, do the shopping that you need to do, and take them if (if she wants to go) it will tire her out and she will be quieter. Does she nap? That is a time out for you. Count your good times in that week. When she gives you advice learn to smile and say umhuh. That has umhuh has saved me so many arguments during my life time. You don't have to do what she says, and she is not going to monitor you to see if you do it. Remember she probably doesn't want to move around every week either.
Maybe the family can get together and find a nice community living place for her. Older people do enjoy being together, if they are not too hard headed to admit it. Because we all have lived through the Depression, World War 11, raising children, working for low wages, and getting our children through their horrible mistakes. We are tired, and wiser than you realilze.
Protect yourself, you do not have to do what people tell you to do. You are a modern women. Amen.
Sincerely, C. N.