We are truly sorry to hear about the heartache and pain you are experiencing due to the separation from your husband and the circumstances surrounding it. We will stand with you in prayer and offer biblical encouragement and advice.
Firstly, we acknowledge that you are seeking the Lord's will in this situation, and that is the most important step. God promises that if we seek Him first, He will guide and direct our paths Proverbs 3:5-6 WEB: "Trust in Yahweh with all your heart, and don't lean on your own understanding. In all your ways acknowledge him, and he will make your paths straight."
Regarding your marriage, it is clear that the bond you shared with your husband was meant to be a lifelong commitment. Marriage is a sacred covenant between a man and a woman, designed by God Himself Malachi 2:14 WEB: "Yahweh has been a witness between you and the wife of your youth, against whom you have dealt treacherously, though she is your companion and the wife of your covenant."
The actions of your husband's daughter are indeed hurtful and deceitful. However, we must remember that God hates divorce Malachi 2:16 WEB: "For I hate divorce," says Yahweh, the God of Israel, "and he who covers his garment with violence!" says Yahweh of Armies. "Therefore pay attention to your spirit, that you don't be unfaithful."
We encourage you to continue praying for your husband and his daughter, asking God to soften their hearts and bring conviction upon them. Pray for a miracle of restoration in your marriage, if that is God's will. However, also pray for the strength and wisdom to accept God's will, whatever it may be. Romans 8:28 WEB: "We know that all things work together for good for those who love God, to those who are called according to his purpose."
In this time of loneliness and weariness, cast all your cares upon the Lord, for He cares for you 1 Peter 5:7 WEB: "casting all your worries on him, because he cares for you."
Let us pray together:
Dear Heavenly Father,
We come before You today, lifting up our sister in Christ who is experiencing deep heartache and pain due to the separation from her husband. Lord, we ask for Your divine intervention in this situation. Soften the hearts of her husband and his daughter, and bring conviction upon them. If it is Your will, Lord, we ask for a miracle of restoration in their marriage. However, we also pray that our sister may have the strength and wisdom to accept Your will, whatever it may be.
Comfort her in her loneliness and weariness, Lord. Remind her of Your unfailing love and faithfulness. Help her to cast all her cares upon You, knowing that You care for her deeply. Guide her steps and show her the way she should go.
In Jesus' name, we pray. Amen.
Lastly, surround yourself with a supportive community of believers during this time. Seek godly counsel and wisdom from those who walk closely with the Lord. Remember that God is always faithful, and He will never leave you nor forsake you Hebrews 13:5 WEB: "...Be content with what you have, for he has said, "I will in no way leave you, neither will I in any way forsake you.""
Stand strong in your faith, and trust in the Lord's unfailing love and goodness.
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
