My mother is getting confused to the point she doesn't know where she sleeps. She doesn't know how she gets into her home. She isn't sure where I live which is one mile down the road. She has known this for years. Is this early Alzheimer's, dementia or just confusion. She isn't this confused when her other children come to visit her from out of town.
It would be helpful to write down your concerns, with specific examples, and send this note in to the doctor before Mom goes in.
And it may be something else entirely. It is usually in late middle stages that they become very disoriented to place, especially their own. Whatever it is it has come on very suddenly so is probably indicating something else. Dementia is a symptom for many things, some can be treated.
There are other possibilities. If the confusion came on suddenly, I would look for other causes, such as an infection or small stroke. Her doctor should be able to tell you something.