What's the deal with my mom? Is she sociopathic? psychotic?

It's 3am. She's coming downstairs because I'm awake. She does this every single night I'm awake to check on me. I'm studying. She makes up weird excuses like that she's "bringing things down," or starts messing around in the kitchen making a shitload of noise like knocking pots & pans (she never actually seems to be doing anything with them other than making noise, and I don't see what she would be doing with them at 3 in the morning anyhow)... She went back upstairs, and soon after I heard her brushing her teeth. Not too long after that (when she heard the door opening), she let the dog out of her room so it would come downstairs. I ******* held my breath until she came down calling after me, asking if the dog was down here. She did it on purpose. This is completely normal behavior for her. Earlier tonight, she was falling asleep at the wheel for the latter part of an hour + drive back home. She took one 10 minute nap, and then I woke her up as she asked me to, and she continued the whole way home in an almost dream state. I don't know how she gets so LUCKY somehow, but she was going 70-80mph the whole time on the highway, in NY (55 state speed limit), and speeding like nuts in town to home also. Not only was she speeding, but she's a pretty tered and flaky person to begin with (thus, driver as well), and because she was so tired, the way she was driving would have come off clearly to anyone else on the road or police officer as though she had been drinking. I was very uncomfortable the whole ride, and tried to state that to her, but she refused to let me drive because it was after 9pm and I only have my permit (all I have to do is take my road test, it's not like the case is that I can't drive), so it's ILLEGAL and she has this superhero complex of some sort -- and she also would refuse to have a cup of ******* coffee since she did insist on driving, to wake her up, and make it SAFE, because she "know[s] [her] body" -- she's on an alkaline diet (strictly health purposes), more of this superhero self-righteous bullshit. She's obsessive and extreme; she checks her alkaline levels every morning with strips, so she quit drinking coffee. When she does, her alkaline levels increase the next morning. This does not even begin to relay a complete sense of her... She did have a pituitary adnoma (sp?) earlier in life, which is a small brain tumor of some sort, and all it meant was that she didn't menstruate, and therefore was unable to bear children. She got rid of it, but she had it for 17 years, I think. That's all I can think of as something that might have had some gradual disintegration effect on her cognitive functioning or something? Please help me, I just need some help understanding. I need some sensical reasonable plausible answer for this.