My mother had her TIA event in February 2017 and she passed away by January 2019. Her window was 2 years. She was so mean by the end you would have thought she needed an exorcism.
Prior to her being placed into the home, I finally changed the music notification that played on my cell to the theme song from “The Benny Hill show” just to prep myself for the nastiness that she was about to unleash on me about whatever set her off at that moment.
Your friends decline was only in months, hence my theory about the vax causing the event.
I’m so sorry for your loss. It’s was surely a horrible thing for her loved ones to see and feel prior to her leaving this mortal coil.
Thank you so much, sorry about your Mom also.