We are truly sorry to hear about your sister's struggle with seizures. We stand with you in prayer, trusting in the healing power of our Lord Jesus Christ.
Let us remember Jesus' words in Matthew 11:28-30 WEB: "Come to me, all you who labor and are heavily burdened, and I will give you rest. Take my yoke upon you, and learn from me, for I am gentle and humble in heart; and you will find rest for your souls. For my yoke is easy, and my burden is light."
In Mark 5:25-34 WEB, we read about the woman who had been suffering from bleeding for twelve years. She touched Jesus' cloak, believing that she would be healed. Jesus said to her, "Daughter, your faith has made you well. Go in peace, and be cured of your disease." We believe that, like this woman, your sister can also be healed by her faith in Jesus.
Let us pray together:
Heavenly Father, we come before You in the name of Jesus Christ, seeking Your healing touch for our dear sister. You are the Great Physician, and there is no disease that can stand against Your power. We ask that You guide her to the right doctors and treatments, and ultimately, that You heal her body completely. Give her strength and courage to face each day, and fill her with Your peace that surpasses all understanding. In Jesus' name, we pray. Amen.
We encourage you and your sister to continue trusting in the Lord, even in this difficult time. Remember that God's ways are higher than our ways, and His thoughts higher than our thoughts (Isaiah 55:8-9 WEB). Keep seeking Him, keep praying, and keep believing.
Lastly, we would suggest that the elders of her church should pray over her, anointing her with oil in the name of the Lord. That is the instruction left by James in James 5:14: Is any among you sick? He should call for the elders of the assembly, and they should pray over him, anointing him with oil in the name of the Lord, and the prayer of faith should heal him who is sick, and the Lord will raise him up. If he has committed sins, he will be forgiven. Also, we would suggest fasting and praying for your sister's healing. Jesus said in Mark 9:29 WEB when asked why the disciples couldn't cast out a demon that this kind can come out by nothing, except by prayer and fasting. Prayer and fasting is a powerful key to gaining God's intervention.