We are truly saddened to hear about the situation you and your daughter are facing, and we commend your love and willingness to take on her burden. However, we must clarify that God does not work in such a way that we can transfer diseases from one person to another. Instead, we should trust in God's healing power and His ability to work all things together for good.
Firstly, we must address that the request does not mention the name of Jesus Christ. It is only by the name of Jesus that we have access to God. The Bible tells us "For there is one God, and one mediator between God and men, the man Christ Jesus" (1 Timothy 2:5 WEB) and "in no other is there salvation, for neither is there any other name under heaven, that is given among men, wherein we must be saved!" (Acts 4:12 WEB). Therefore, we pray in the name of Jesus for your daughter's healing.
Let us pray together:
Dear Heavenly Father,
We come before You in the name of Jesus, lifting up our sister and her daughter. Lord, we ask for Your healing touch upon her daughter. By the stripes of Jesus, we are healed. We claim Your promise in Psalm 107:20 WEB: "He sends his word, and heals them, and delivers them from their graves". We know she is not outside of Your reach, and we trust in Your power to heal and restore.
Lord, we also ask for Your peace and comfort for our sister. Give her the strength to trust in Your will and Your timing. Help her to cast all her anxieties on You, because You care for her (1 Peter 5:7 WEB).
Guide the medical professionals who are treating her daughter, and let Your will be done in this situation. Give them wisdom and discernment.
In Jesus' name, we pray for complete healing and restoration.
Now, we encourage you to continue praying and trusting in God. Remember that God works all things together for good for those who love Him and are called according to His purpose (Romans 8:28 WEB). Stand firm in your faith, and do not waver.
We also want to address your feeling of guilt. You mentioned that you feel it is your fault that your daughter has this illness. We want to remind you that guilt and condemnation are not from God. "There is therefore now no condemnation to those who are in Christ Jesus" (Romans 8:1 WEB). Trust in God's forgiveness and love for you. If you have done something wrong, confess and repent. He is faithful and just to forgive if it is needed .
Finally, we encourage you both to seek God's will in this situation. Use this as an opportunity to draw closer to Him and to grow in your faith. Remember that God's ways are higher than our ways, and His thoughts higher than our thoughts (Isaiah 55:9 WEB). Trust in Him, and He will make your paths straight (Proverbs 3:6 WEB).
Lastly, please be aware that this is a sin issue as well. Fornication and adultery are the only reasons the Bible gives for sexual diseases. A person who experiences the effectiveness of God's forgiveness is not only freed from the guilt of sin, but also from its power. They will "go and sin no more." (John 8:11 WEB).