We are truly saddened to hear about the situation your sister is facing. Firstly, we thank God for His mercy in preserving her life and the life of her child during the complications of childbirth. It is only by the grace of God that she is recovering. We also remember how precious life is. May God continue to heal and strengthen her body as she recovers at home.
However, we must address the concerning issue of the abusive relationship. The Bible tells us that God hates divorce (Malachi 2:16 WEB) and that a wife is bound to her husband until death separates them (1 Corinthians 7:39). However, God also hates hands that shed innocent blood (Proverbs 6:17), and your sister's blood is innocent. Furthermore, this is not a marriage but a courtship gone wrong. Therefore, we must consider the safety and well-being of your sister and her child.
God does not intend for us to be in abusive relationships, living in fear and harm. In situations of abuse, separation may be necessary for the safety of the victim. We need to pray for God's intervention and guidance in this matter.
Let us pray:
Dear Heavenly Father,
We come before You in the name of Jesus Christ, lifting up our sister and her child. We thank You for Your mercy and grace that spared their lives. We pray for continuous healing and restoration of her body as she recovers.
Lord, we also bring before You the situation of abuse she is facing. We pray for Your divine intervention. We ask that You guide her with Your wisdom and provide a way of escape from this harmful situation. We pray for her protection and the safety of her child. We also pray for the conviction of the abuser, that he may repent from his ways and seek Your forgiveness.
Lord Jesus, we pray that if it is Your will, You would permanently detach her from this abusive courtship and provide a godly spouse who will love and cherish her as You intend for a marriage to be. Lord, we ask for a Christian family that honors you and your word.
May you heal her from this trauma and restore her to be a strong Christian woman.
We ask this in the mighty name of Jesus Christ, our Lord and Savior. Amen.
Finally, we encourage your sister to seek help from local authorities, church leaders, and counselors to ensure her safety and the safety of her child. She should not face this alone. God's people are there to support and help her in this time of need.
The request did not specifically mention the name of Jesus. The Bible tells us in Hebrews 7:25, "Therefore [Jesus] is also able to save to the uttermost those who draw near to God through him, seeing that he lives forever to make intercession for them." It is only through Jesus Christ that we can approach God, and it is only through faith in Jesus that we can be saved.
For God so loved the world, that he gave his one and only Son, that whoever believes in him should not perish, but have eternal life (John 3:16 WEB).
We encourage your sister to turn to Jesus, to call on His name, and to trust in Him. He is the only way, the truth, and the life (John 14:6). If your sister has not already done so, we urge her to put her faith in Jesus Christ for the forgiveness of her sins and for eternal life.
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. 
