I have an 82 year old mother who I am quite concerned about. She can seem fine one day and then the following week can seem like she's in a dream world. She doesn't connect with me and seems completely focused on the past or thoughts in her head, to the point I feel she hardly notices I am there. She will suddenly make a very hurtful remark without realising it. Mind you, she has always done that. I am worried about her. She seems disordered and confused and depressed. I asked her if the doctor had tested her for vitamin deficiencies, but she says she is fine and eats well. She really doesn't. My siblings are in denial and won't listen.
What in others experience are the signs of dementia, or is she just depressed?