We are truly sorry to hear about the loss of your father, Slaeltar. It's understandable that you're feeling overwhelmed and struggling with memories. It is important to remember, that you did not pray in the name of Jesus Christ. It is only by His name that we have access to God.
Firstly let us address your feelings of doubt. Remember in the book of Romans it is written, For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord Romans 8:38,39. So you are definately still His baby girl.
In times of trouble, we can always turn to God for comfort and strength. As it says in Psalm 34:18 WEB The Lord is near to those who have a broken heart, and saves those who have a crushed spirit and in Psalm 147:3 WEB He heals the broken in heart, and binds up their wounds.
Regarding the challenges you're facing, remember that God will not give us more trouble than we can handle because it is written, There hath no temptation taken you but such as is common to man: but God is faithful, who will not suffer you to be tempted above that ye are able; but will with the temptation also make a way to escape, that ye may be able to bear it. 1 Corinthinians 10:13. However, it is also important to take every thought captive and bring it into the obedience of Christ. NKJV. This is because the devil can be tricky and take advantage of our sorrow to cause even more problems.
Grief is a normal process, and it's important to allow yourself to feel it, but remember that we are God's children and we have the ability to cast our worries upon him for he cares for us. 1 Peter 5:7. We do have God's promise of peace that passes all understanding. But you must specifically pray for it. Philippians 4:6,7.
Regarding your studies, trust that God will give you the wisdom and knowledge you need. As it says in James 1:5 WEB But if any of you lacks wisdom, let him ask of God, who gives to all liberally and without reproach; and it will be given to him.
Let us pray together for you.
Dear Jesus,
We lift up Slaeltar to You, asking for Your comfort and strength during this difficult time. Help her to cast all her anxieties on You, knowing that You care for her. Give her the peace that passes all understanding. Guide her as she navigates her studies and helps her to trust in Your wisdom and knowledge. In Your precious name, we pray. Amen.
Lastly, remember that if you do not have a personal relationship with Jesus Christ that it is written. Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved. Acts 4:12. So believe on the Lord Jesus Christ, and thou shalt be saved, and thy house. Acts 16:31