She sounds like a good person and a good influence in your life, we pray with you for GOD to give her strength and wisdom.
At 84 years she probably has more wisdom than a lot of us. It is good for you to stand by her side now and help her with her needs the same way she did with you. GOD will bless you for it
I pray that she has many more years to share her wisdom and enjoy her retirement years in good health and happiness.
I pray GOD's blessing to her and your family