Mom was diagnosed with Alzheimer's and targeted me by making up things and she took me off her will after 43 years, is this normal?

Mom and me were always best friends and we could tell each other anything. We have always been close but after she was diagnosed with Alzheimers, that changed. Is it true they will target the person they love the most? I'm no longer in the will and mom has since passed away and everyone now thinks, wow, what did she do to mom that mom took her off the will. This hurts me terribly because I would never hurt my mother or say anything disrespectful, I love her with all my heart and now not only am I not in the will but some of my family members think I did or said something to upset mom and that's not true. I can sleep at night because I know that I did nothing but it just hurts that people think things of me that aren't true. I know I can't do anything about what people think but it still hurts. Is this normal for a family member with Alzheimers to target someone whom they love dearly? OR do you think she might really feel this way about me? It only changed when mom got this terrible, terrible disease! Thank you for your help. I know the last question might not be answered because you didn't know mom but I just want your opinion on that.