My mother has been pretty ADD about things, forgetting what I said or dropping all her attention during conversations, but just now something really fucking weird happened.

I was in my room playing games on my xbox 360, previously today I was playing it and I was at a cut scene, she walked in and noticed and then went away, but just now I was watching a cut scene and out of nowhere shes in my room, looking at my LCD just standing there, then a few seconds later she left the room.
When the scene was over I paused and went into the living room to ask her what she wanted, she said she wasn't in my room, I told her she was, because I SAW HER, but she completely denied being in there.
I know she was in there, I saw her, not a shadow, but everything, including the colors of her clothes, I regret not asking her what she wanted when she was standing there.

What should I do?
Should I call a doctor or something, I really don't want to live with a mentally ill person, but I have nowhere to go.