We are truly saddened to hear about your situation and the struggles you're facing with your mother. First, we want to address the title of your request.
Praying for someone's death is against biblical principles. The Lord tells us, Honor your father and your mother, as WEB says in Exodus 20:12. Furthermore, anyone who hates his brother is a murderer, and you know that no murderer has eternal life remaining in him as mentioned in First John 3:15. This is a serious issue and needs to be addressed first. It is important to recognize the sanctity of life and the importance of honoring our parents, even in difficult situations.
It's clear that you are experiencing a lot of pain and frustration, but it's crucial to approach this situation with love, patience, prayer, and understanding. The scriptures say, "Get rid of all bitterness, rage and anger, brawling and slander, along with every form of malice." in Ephesians 4:31. Instead, "Fathers, do not provoke your children to anger, but bring them up in the discipline and instruction of the Lord." in Ephesians 6:4. Children must learn to honor their parents. No where in the scriptures does it permit hatred or evil thoughts towards parents. But, you must also understand that scripture does not permit a parent to rule their children with an iron fist or making a child feel worthless.
Regarding your friendship, it's important to choose friends who are godly and who will have a positive influence on your life. Proverbs 12:26 says, A righteous person is cautious in friendship, but the way of the wicked leads them astray. It is also not forbidden to have a close friend to provide emotional support. If this relationship with your friend is a healthy relationship this needs to be communicated to your mother and you should not be forced to do things that you do not want to.
Regarding your marriage, scriptures say, "Therefore a man shall leave his father and mother and hold fast to his wife, and the two shall become one flesh. " in Ephesians 5:31. It is also unacceptable for a parent to drive your marriage apart. If this was God's will for you to be married you need to make sure that this was made known to your parents. Your duty as a wife is to be obedient to your husband and your husband alone, not your mother. All believers must obey scripture rather than the desires of our mothers and fathers. And all mothers and fathers must recognize when their children should leave the household to become one with their spouse.
Let's pray together:
Father God, we come to you in the name of Jesus, pleading for Your intervention in this difficult situation. We pray that You would soften your mother's heart and help her to see the value and love that you bring to her life. We ask for forgiveness if there are any feelings of bitterness and hate and ask for them to be removed from your life. We pray that she would come to know Jesus as her personal Savior and have her heart convicted by the Holy Spirit if this has not already happened. Help her to understand that her daughter needs and deserves happiness in life. We also pray for you,that God would grant you the strength, wisdom, and patience to navigate this challenging time. Help you to forgive your parents and find rest in His love. Open your heart to hear His voice and to do his will. We pray all of this in Jesus Name, Amen.