Mom Acting Disoriented for 2 Days.

For the past few days, my Mom has been acting disoriented. She can't seem to form full sentences, she can't answer most questions, and she's just been acting very out of it. I try to ask her things, and she just looks at me blankly and laughs or studders for a minute (saying "I'm.... I'm just... ") before becoming distracted by cars driving outside or noises from downstairs. She often forgets that I just spoke to her, and she forgets things we just said. Today, while I was in the bathroom she went outside and started walking up the street in the rain, when I asked her where she was going she couldn't tell me, almost like she couldn't get the words out or didn't know. Her whole body is shaky as well. When I looked up her symptoms online, I saw Mini-Stroke come up quite often, but I'm not sure because there's no numbness or headaches. I don't know whether to take her to the E.R. or not, as today is Saturday and I can't make a regular doctor appointment until Monday.