Alzheimer's is a form of dementia. Hopefully the doctor ran a bunch of tests before giving here the diagnosis.
You have to coordinate with her doctor for care, and the society has a lot of good tips. Mostly a rigid schedule in the beginning will help. As she degrades it can depend on how she is and you will have to make changes as needed, hospital bed, more help, diapers etc.
I have known many people with this illness. For some it is best to be in a care place where they will not get hurt, for others the siblings decided to care for the parents at home. I hated watching a woman friend to my Mom who was placed in a home and just was in bed till she died, maybe that was best- but it was hard to watch.
I don't know if there is any connection, but I read once about Gluten and Memory loss. You might read up on that and just see... I really don't know. I am going to see if getting my Mom's husband off of gluten will help him, it might just a last ditch effort but it might help.
You might have your Mom's Thyroid checked, and also look into her meds. If her thyroid is low, look at her meds for gluten too... again, this is just a thought... I have no experience in this at all right now.