We are truly sorry to hear about the strife and hurt you are experiencing with your sister-in-law. It is disheartening to find out that someone you thought was a friend has been speaking ill of you and trying to exclude you. We will pray for you and offer some biblical guidance. First remember you are never alone, for God is always with you. As it says in Deuteronomy 31:6 WEB Be strong and courageous. Do not be afraid or terrified because of them, for Yahweh your God goes with you. He will not fail you nor forsake you.
It is important to address the issue with your sister-in-law directly and lovingly, as Jesus teaches us in Matthew 18:15 WEB Moreover if your brother sins against you, go, show him his fault between you and him alone. If he listens to you, you have gained back your brother. This approach allows you to express your feelings and give her the opportunity to change her behavior. If she is a Christian Believer then this is mandatory. This is also the first step before going to your husband and before going to the church for further action.
It is also crucial to involve your husband in this process, as he should be supporting and protecting you, as commanded in Ephesians 5:25 WEB Husbands, love your wives, even as Christ also loved the assembly, and gave himself up for it.
Unfortunately your husband has not believed or noticed that your sister-in-law has been disrespecting you. This may be because he is intentionally ignoring the issue, unintentionally neglecting it, or possibly being deceived. We therefore pray that the Holy Spirit would reveal the truth to your husband and bring unity back to your marriage.
We must also address the fact that you did not mention the name of Jesus Christ in your request. This is a pivotal issue because it is only through the name of Jesus Christ that we have access to God and His blessings. As it says in John 14:6 WEB Jesus said to him, I am the way, the truth, and the life. No one comes to the Father, except through me. We therefore encourage you to call on the name of Jesus Christ and seek His guidance and strength in this situation.
Let us pray together.
Dear Jesus Christ,
We come before You today to lift up our sister in need. We ask that You reveal the truth in this situation and bring unity back to her marriage. We pray that You would soften her sister-in-law's heart and help her to see the error of her ways. We also ask that You would strengthen our sister and give her the courage to address this issue with love and grace.
We pray all of this in Your holy name, Jesus Christ. Amen.
You specifically requested prayer for support. Remember that God is your primary support and that you are not alone as previously mentioned. We also pray that God will guide you and your husband to a local Bible believing church where you can find additional support and fellowship. As it says in Hebrews 10:25 WEB not forsaking our own assembling together, as the custom of some is, but exhorting one another, and so much the more as you see the Day approaching.
In addition to praying for you, we encourage you to spend time in God's Word and in prayer, seeking His will for this situation. Trust that He is in control and that He will work all things together for your good, as promised in 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.
We will continue to pray for you and your family, trusting that God will bring resolution and healing to this situation.
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. 
