sruff20000,
I am very sorry about your Mother's illness. You request advice but don't say what her wishes are. Does she want to have treatment? Is she mentally competent? If so, her wishes are very important in the final decision. If not, you must gather sufficient data to make the best decision for her, along with the doctors.
Angiodysplasia is not a diagnosis of cancer. It is a condition related to the aging and degeneration of blood vessels. It occurs mostly in older adults and because the vessels are enlarged and fragile, GI bleeding results.
Platelike atelectasis is also not a diagnosis of lung cancer. You need to speak with her doctors and get a better idea of exactly what is wrong with your Mother so you can make good medical decisions for her.
You also need to reassure her that you love her and will be there for her. She is no doubt terribly frightened and afraid of what is in store for her. Give her lots of hugs, hold her hand, tell her you love her and will take good care of her, then do it.
You are a good daughter and I am sorry you don't have help with all of this. But think about how much your Mother needs you and how proud she is of you for taking such good care of her. Whenit is over, you will be sad she is gone, but you will have no regrets or guilt.
Wishing you strength and courage for your journey.