We are truly sorry to hear about the struggles your mother is facing with her health and the loss of her husband. We will lift her up in prayer and seek God's will for her situation together in Jesus' name.
Firstly, we want to remind you of the power of calling on the name of Jesus. It is only by His name that we have access to God the Father and there is no other name by which we can be saved. As the Bible tells us in Acts 4:12 WEB: "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved." If your mother hasn't accepted Jesus Christ as her Lord and Savior, this is time to call on Jesus.
Let's pray together now for your mother.
Almighty God, we come before You in the name of Jesus, lifting up the mother of our friend. Lord, You know the depth of her sorrow and the pain she carries in her heart. We pray that You would comfort her in her grief and fill her with Your peace that passes all understanding, as You've promised in Philippians 4:7 WEB: "And the peace of God, which surpasses all understanding, will guard your hearts and your thoughts in Christ Jesus."
Father, we also ask for Your healing touch upon her body. We pray that You would reverse the effects of Alzheimer's, diabetes, and depression. As You've told us in Psalm 103:2-3 WEB: "Bless Yahweh, my soul, Don't forget all his benefits, who forgives all your iniquities, who heals all your diseases," We believe it is Your will for her to be whole.
Lord, we also pray for her emotional healing. Help her to cast all her cares upon You, as You've instructed in 1 Peter 5:7 WEB: "casting all your worries on him, because he cares for you." Help her to find her strength and joy in You alone.
In Jesus' name, we rebuke the spirit of sadness and depression that has been attacking her. Father of mercy and God of all comfort, we pray that You would comfort her in her affliction, so that she may be able to comfort those who are in any affliction, with the comfort with which You comfort her, as stated in 2 Corinthians 1:3-4 WEB: "Blessed be the God and Father of our Lord Jesus Christ, the Father of mercies and God of all comfort; who comforts us in all our affliction, that we may be able to comfort those who are in any affliction, through the comfort with which we ourselves are comforted by God."
Father, we also pray for her late husband's family and loved ones. We pray that they would know Your love and comfort at this time. We pray that they would come to know Jesus as their Lord and Savior if they haven't already.
Lord, we thank You for the promise of eternal life with You. We thank You for the hope that we have in Jesus, that this world is not the end. We pray that You would give her mother a glimpse of this hope and that she would come to know You more deeply through this trial.
In Jesus' name, we pray for all this. Amen.
Lastly, we encourage you to continue to support your mother in her time of need. The Bible says that you are to honor your father and mother, as Exodus 20:12 WEB states: " Honor your father and your mother, that your days may be long in the land which Yahweh your God gives you." The Bible describes this as the first commandment with a promise. Take heart in knowing that as you honor your mother, God sees and He will bless you.
Remind her that even though her husband was a good man, God is the ultimate comforter and husband. Remind her of Isaiah 54:5 WEB: " For your Maker is your husband; Yahweh of Armies is his name. The Holy One of Israel is your Redeemer. He is called the God of the whole earth."
May God bless you and your family.
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
