We are truly concerned about the situation your granddaughter is in. Whenever we see such issues, our hearts turn to God's word for guidance. Firstly, we must remember that God cares deeply for the vulnerable, and that includes your granddaughter. In Matthew 19:14, the WEB Jesus said, "But Jesus said, 'Allow the little children, and don't forbid them to come to me; for the Kingdom of Heaven belongs to ones like these.'"
We need to pray for your daughter and your granddaughter, asking God for His protection and intervention. However, we must also consider that God has given us the responsibility to act in such situations. In James 1:27, the WEB it says, "Pure religion and undefiled before our God and Father is this: to visit the fatherless and widows in their affliction, and to keep oneself unstained by the world."
Let us pray:
"Father in heaven, we come before You in the name of Jesus, pleading for Your intervention in the life of our sister's granddaughter. Lord, You see the conditions she is in, and we ask that You would change them for her good and Your glory. Give her mother the wisdom and courage to do what is best for her child, and provide a safe and nurturing environment for this precious little one. Guide us all in how we can support and help them in this time of need. We pray this in the mighty name of Jesus, Amen"
We also encourage you to take actions within your capacity to ensure the safety and well-being of your granddaughter. This might involve open conversations with your daughter, or even seeking help from local authorities or social services if the situation warrants it. Remember, we are not only to pray but also to act as the hands and feet of Jesus. Proverbs 3:27 WEB states "do not withhold good from those to whom it is due when it is in the power of your hand to do it."
Lastly, we notice that your request did not mention Jesus Christ. It is only by the name of Jesus that we have access to God. The Bible says "for there is no other name under heaven that is given among men, by which we must be saved!" in Acts 4:12 WEB. Therefore, if anyone has not received Jesus Christ as their savior, we would encourage them to believe in Him and accept Him as Lord and Savior of their lives. Jesus said "I said therefore to you, that you will die in your sins; for unless you believe that I am he, you will die in your sins." in John 8:24 WEB.