The word says that there is no unrighteousness with God... Romans 9:14, "What shall we say then? Is there unrighteousness with God? God forbid. For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion." His judgments are just, pure and true. The Lord has eyes of fire. I am personally of the opinion that if no one has the opportunity to receive the Gospel, then it would be unjust for God punish someone whom had no opportunity. However, my answer is derived from scripture, rather than being something directly promoted by scripture.
You can no more say an unborn child is going to hell from a scriptural point of view than someone can say they are going to heaven. I would venture to say that anyone on either side of the argument could develop derived doctrines about it. The scriptures, in my knowledge, have almost nothing to say about it. But I will say that to believe that God sends people to hell is double predestination, and even the staunchest arbitrators of certain doctrines have fought against such erroneous thinking. (I will not respond to any debates about the unmentionable argument here on SI as per the moderators request, so please do not debate this, thank you.)
I have lost three children to the grave before they were born, in each case, my wife and I knew the peace of God in our hearts that they were in His hands.
The reason I say that the secret things belong to God is because the one area I believe the scripture says that we are not to be arbitrators of judgment is in the area of eternity. I believe our response to the question is faith that the Lord will do what is right. For every individual ever conceived, it will be up to Jesus Christ to separate the wheat from the chaff, the sheep from the goats. We can only know by fruit. We can only exhort unto salvation. We simply cannot sit on the throne and dole out God's judgments. I personally "think" that the unborn are going to be with the Lord. But like I said, it is a derived understanding from the character and nature of Jesus, not from any direct statement in the word. I trust that He will do what is right. As such, no lie, no falsification, nothing that is not approved of by Him will survive that burning gaze...
I am sure the half-hour of silence in heaven is going to correct a lot of our understanding about these sorts of things as well as give us a peace in the presence of Christ never known. Deuteronomy 32:3-4 says "I will publish the name of the LORD: ascribe ye greatness unto our God. He is the Rock, his work is perfect: for all his ways are judgment: a God of truth and without iniquity, just and right is he."
While, I have offered you my opinion brother, I still stand by my original statement as my absolute confidence. I am so confident in the perfect judgment of Christ that I trust implicitly, without question, His decisions. Even if I am wrong about them in this life. One of the greatest commentaries in the scripture on this topic, I feel, is found in Luke 13:1-5. "There were present at that season some that told him of the Galilaeans, whose blood Pilate had mingled with their sacrifices. And Jesus answering them, (I love how it never states the question) Suppose ye that these Galilaeans were sinners above all the Galilaeans, because they suffered such things? I tell you, Nay: but except ye repent, ye shall all likewise perish. Or those eighteen, upon whom the tower in Siloam fell, and slew them, think ye that they were sinners above all men that dwelt in Jerusalem? I tell you, Nay: but except ye repent, ye shall all likewise perish."
The question of Gods justice, and a persons eternal position is supposed to lead us each to this one conclusion...repent or perish yourself. Tell others to repent or perish themselves. God will sift in finality...not us brother. I hope and pray that God gives you peace about your sister. I pray that forgiveness is the concern of your heart above that of theological conclusiveness.
I am sorry for such a wicked tragedy in your life IWantAnguish. God is just.