Possible Dementia. Please advice!

My mom was treated by Dept. of Neuromedicine (Apollo Hospitals) for various pain in hands and legs during the year 2010-2012. She was referred to the a Psychiatrist at the same time. She had symptoms of depression and insomnia and slight memory loss. She has a family history of dementia . Her maternal uncles and mother were patient of Dementia. We informed the same. She was prescribed the below medicines Inspiral SR Nexito Clonotril Oleanz These drugs continued till 2013 where we decided not continue them further without discussion. Since 2014 her condition has deteriorated rapidly and currently has all the below symptoms. Acute Memory loss Talks about people and events of pasts with not current co-relation. Loss of communication skills - speaking & writing Disorientation to time and place Fear of people, agitation She was a teacher and retired in Dec 2014 due to the health condition. She is also aware of her health condition shows sings of unhappiness. Please advice