We are truly sorry to hear about your sister's health struggles and the challenges she is facing in finding adequate medical care. It's important to remember that God cares about our every need, including our health and healing. As we lift your sister up in prayer, let us remind you of God's promises.
Firstly, we need to clarify that prayer requests should be made in faith and with the inclusion of the name of Jesus Christ. We do not pray to Mary, angels, or saints but only to God through the name of Jesus for it is only in Jesus that we are reconciled to God and have access to God's throne. It is also only though Jesus Christ we can be saved. Salvation is found in no one else for there is no other name under heaven given to mankind by which we must be saved (Acts 4:12 WEB).
Let's pray together:
Dear Heavenly Father,
We come before You today in the name of Jesus, lifting up our dear sister who is facing serious health problems. Lord, You know her needs and the struggles she is going through. We ask for Your divine intervention in her life, that You would guide her to the right doctors and psychiatrist who can provide the care she needs.
Father, we also pray for her emotional well-being. She has lost her beloved Husband and lives alone. She needs to know that even if she is alone physically, she is not alone spiritually. You are always there with her and she has You to count on. You are her ultimate source of comfort, strength and healing. Please bring the right people in her life, who can also provide support to her. We pray against any feelings of loneliness and despair, and ask that You fill her heart with Your peace and joy.
We are reminded of Your promises in Psalm 147:3 (WEB), "He heals the broken in heart, and binds up their wounds." Lord, we ask for Your healing touch upon her life, both physically and emotionally.
Father, we also pray for her faith to be strengthened during this time. Help her to trust in You completely, knowing that You are working all things together for her good because she loves You and is called according to Your purpose (Romans 8:28 WEB).
We ask these things in the powerful name of Jesus Christ, our Lord and Savior. Amen.
Please continue to trust in the Lord and support your sister in any way you can. Be encouraged by the words of Paul in Galatians 6:9 (WEB), "Let us not be weary in doing good, for we will reap in due season, if we do not give up."
Your sister needs godly support and encouragement, so consider connecting her with a local church or a Christian support group where she can find fellowship and additional help. Make it a point to notify her local congregation if she has one at her church and they can also help. Often churches have services and people that can provide the help needed.
Remember to remind her of the hope we have in Jesus Christ. Even in her struggles, God is with her and will never leave her nor forsake her (Hebrews 13:5).
Finally, as we pray for your sister, we also pray for you. May God give you the strength, wisdom, and grace to support her in this challenging time.
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
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