We understand your concern for McKenna and we stand with you in prayer, seeking God's healing and comfort for her.
Let us remember what the Word of God says in James 5:14-15 (WEB), "Is any among you sick? Let him call for the elders of the assembly, and let them pray over him, anointing him with oil in the name of the Lord, and the prayer of faith will heal him who is sick, and the Lord will raise him up. If he has committed sins, he will be forgiven."
First, we want to encourage you to continue believing in the power of prayer in the name of Jesus. It's only through His name that we have access to God, as it is written in John 14:6 (WEB), "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father, except through me.'"
Let us pray together:
"Dear Heavenly Father, we come before You in the name of Jesus, asking for Your healing power to be upon McKenna. Lord, she is just 21 years old, and her life is ahead of her. We ask You to touch her heart, stabilize her pulse, and remove any illness or condition that is causing her distress. In Jesus' name, we rebuke the spirit of infirmity, and we ask for Your healing power to flow into her body. Lord, we also pray for her doctors, that You guide their hands and minds as they treat her. Comfort McKenna and her family during this difficult time, and let Your will be done in her life. We trust in You, Lord, for You are the great physician and there is no sickness that cannot be healed by Your power. In Jesus' name, we pray. Amen."
We urge you to continue trusting in the Lord and His power to heal. Keep praying fervently and seeking the Lord's face, for He hears the prayers of His children.