Demons or Dementia as it relates to Alzheimers

My mother is in her early 70's and has started forgetting how to do normal everyday things. She will seem normal for several days, then suddenly begins to slurs her words, shuffle her feet, lose her balance and can't remember what she is doing, or even trying to say. When she is confused, she becomes very angry. Mom was diagnosed with pernicious anemia when she was in her thirties and has taken B-12 injections twice each week ever since then. Is there a relationship between this type of anemia and Alzheimer's?