In the Bible, The Judge Samson killed himself, and a huge number of Philistines, and later on in another book of the Bible he is mentioned in a list of heroes. He made it to Heaven and committed suicide. Not unforgivable. Denying Jesus is unforgivable. Dying without accepting His offer of forgiveness. She was a young girl and God takes everything into account. In the end, none of us have any idea what happened to her as it wasn’t our call.
https://en.wikipedia.org/wiki/Maximilian_Kolbe
Continuing to act as a priest, Kolbe was subjected to violent harassment, including beating and lashings, and once had to be smuggled to a prison hospital by friendly inmates.[2][16] At the end of July 1941, three prisoners disappeared from the camp, prompting SS-Hauptsturmführer Karl Fritzsch, the deputy camp commander, to pick 10 men to be starved to death in an underground bunker to deter further escape attempts. When one of the selected men, Franciszek Gajowniczek, cried out, “My wife! My children!”, Kolbe volunteered to take his place.[8]
Kolbe’s recognition as a Christian martyr also created some controversy within the Catholic Church.[22] While his ultimate self-sacrifice of his life was most certainly considered saintly and heroic, he was not killed strictly speaking out of odium fidei (hatred of the faith), but as the result of an act of Christian charity. Pope Paul VI himself had recognized this distinction at his beatification by naming him a Confessor and giving him the unofficial title “martyr of charity”. Pope John Paul II, however, when deciding to canonize him, overruled the commission he had established (which agreed with the earlier assessment of heroic charity), wishing to make the point that the systematic hatred of (whole categories of) humanity propagated by the Nazi regime was in itself inherently an act of hatred of religious (Christian) faith, meaning Kolbe’s death equated to martyrdom.[22]
Greater love hath no man than this, that a man lay down his life for his friends.
John 15:13