How do I get more patience with my mother?

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I love my mother very much. I am her only child and we have always been close. She lives in the same house as me and my husband. She has always helped me and my children but now she is old and her memory is getting bad. I want to be patient with her, but it is so difficult when she asks the same things over and over again. She can say very rude things because she doesn't understand they are rude. She frequently loses things and makes mistakes, and when I tell her she made a mistake she either gets angry with me or sad and says she wants to die and not to be a burden. I hate when she says such things. I know I should say every time that she is not a burden, but I get embarrassed and tired of the same things repeating every day.