Very great question.
I sense that this question of yours comes from a very deep and personal experience. I would like to send my condolonces and comfort for your daughter who passed away early. Truly, the Bible gives us assurance that God of comfort will comfort us in every hardships. (2 Corinthians 1:3) I know it is not easy, but God would sustain you to go through.
The most temptation an apologist can do in this time of situation is to give a rational answer to what happen to those who never heard of Jesus. That is necessary, but it is not enough, we as those who give answers to these kind of questions must also lead people to God.
What do I mean by that? Let me focus on the two questions you raised. I’m going to be brief here, those who people who have never given the change to hear or know about Jesus has two folds.
1.) Natural World - every details and information and beauty of our world points out to a Creator. It is the same to the people in the Old Testament, they never heard about Jesus, but they are aware that there is a God.
2.) Conscience - whether we believe in the Bible or not, we are embedded to some kind of morality inside us, to know what is right and wrong, and do what is right and despises the wrong. And that kind of sense of morality leads to a moral law to a Moral Lawgiver (God).
The clarification here, people are not judged by God based on what they do not know, but based on what they do know. On what they did on the evidence of the natural world about God and their conscience.
Moving to your question about your daughter, the Bible gives us the assurance that the Judge of all the earth shall do that which is right (Genesis 18:25). It means in the nature of God, He cannot contradict Himself, if He says He is just God, therefore we have the confidence that He would that which is right, fair, and justly.
Additionally, one of the greatest difference of God to humanity is God can navigate someone’s life into eternity. He knows best than we do. He controls life and eternity than we do. It must be hard, but the first and fundamental thing we need to play is to trust Him for who He is.
Jesus says He is the resurrection and the light, the way the truth the life, and said because I live you also shall live. Trust Him for your daughter’s life and in the present, you could do the same thing too.
I hope these helpful!