Welcome, Intrepid.
I was caregiver to my mom, the last 18 months in my home, before she completed her journey on Oct. 18, 2007. I was one of the lucky ones who had a very compliant and easygoing "patient." She rarely fought me over bathing, hair, medication, etc.
Hospitalization is very confusing to a person with dementia with all the new people, sights, sounds, surroundings.....and they usually calm down once they are back home (wherever home is.) Getting back into a "routine" helps tremendously and she should respond well to that.
Redirection is a very useful "tool" especially when questions become irritatingly repetitious, or behavior is troublesome. It doesn't always work, but because of the short term memory loss it usually does.
You can find a lot of good information about AD and tips on how to cope from the Alzheimer's Association website:
www.alz.org. It also has message boards and you need not "join" to read posts. Twice Blessed (screenname) has posted a lot of general info and tips and you can find her posts using the "search" function at that site.
You will learn your mother is unique in her AD and will never be a textbook case -- there is no such animal. She will easily slip back and forth between stages and you learn very quickly to just go with the flow (because you can't explain or argue with your ADLO -- it just doesn't compute in their brain.)
Learn as much as you can. Ask as many questions as you have. Come back here frequently for info and lots of support and understanding. Because we DO understand and know what it's like. We're on the same path and get it like no one else.
You are a wonderful daughter to take on this challenge and you will be truly enriched by this experience.