That's NOT what I said !!!!

Well what did you say? This is a new issue. My mother will open her mouth and what she wants to say comes out mixed up totally.  We look at her to see if she realizes what she is saying is nonsense and acknowledge it is not quite right, or we say that didn't make much sense, can you try again?  She EXPECTS and WANTS me to decipher what she is trying to say when she does indeed realize it wasn't like it should be.  My frustration level is high, and I can only wonder what it feels like to sorta know that what you said makes no sense. Alot of the time, she looks at us like that was right wasn't it???? We laugh lightly and say no.. not quite.  She wanted to call her good friend that prepared meals with her on Saturdays at her previous church. She turned to me and said I want to call that Dr. from church PERIOD.  Doctor? Yes you know that Dr.  The Dr. that I used to work with on Saturdays, etc.. I said if you mean Steve he owns a bar and he is not a Dr.,  Mother. Oh well, maybe that is it.  You can be riding along and she will look out the window and say the trash can is on the car. She knows instantly that it might not be right and I have no idea, driving the car looking for a trash can on a car. 
My great aunt lived with my family when I was growing up. She had dementia the whole time I remember her being there.  She had to leave the family when she became uncontrollable. I remember she would physically beat my mother and father as they put her to bed. She had to be locked into the basement because she would go out and wander outside the house. Back then you didn't have deadbolts and chains on doors, although we did add a chain.  She would sit on the stairs leading to the outside door inside the kitchen and look at the people and cars. She would say--look at that doofunny... there goes another doofunny.  She would tell things that made no sense and wind a long tale around the nonsense.  This is where we are headed.  Mother won't be locked in her basement apartment, she lives in my house with me and my daughter. But she will have to be safe and in assisted living, with all the other doofunnies....