Not a single person in the history of mankind that was predestined by God to be baptized, ever was not validly baptized.
St. Augustine: “If you wish to be a Catholic, do not venture to believe, to say, or to teach that ‘ they whom the Lord has predestinated for baptism can be snatched away from his predestination, or die before that has been accomplished in them which the Almighty has predestined.’ There is in such a dogma more power than I can tell assigned to chances in opposition to the power of God, by the occurrence of which casualties that which He has predestinated is not permitted to come to pass. It is hardly necessary to spend time or earnest words in cautioning the man who takes up with this error against the absolute vortex of confusion into which it will absorb him, when I shall sufficiently meet the case if I briefly warn the prudent man who is ready to receive correction against the threatening mischief.” (On the Soul and Its Origin 3, 13)
God does not need to bring anyone back from the dead to baptize them, he has all the time in the world to do it anytime He wishes for everyone. Yet, there are 1000's of examples of people brought back from the dead, just to be baptized. Why would God show us that, except to teach us "Amen, amen I say to thee, unless a man be born again of water and the Holy Ghost, he cannot enter into the kingdom of God"? Here's one example, of a person that everyone including herself, thought was baptized.
From : Peter Claver: Saint of the Slaves, by Fr. Angel Valltiera, S.J., Burns and Oates, London, 1960, pp. 221,222.:
"The affair of the slave Augustina, who served in the house of Captain Vincente de Villalobos, was one of the strangest in the life of Claver...When Augustina was in her last agony Villalobos went in search of Claver. When the latter arrived the body was already being prepared for the shroud and he found it cold to the touch. His expression suddenly changed and he amazed everyone by crying aloud, "Augustina, Augustina." He sprinkled her with holy water, he knelt by her, and prayed for an hour. Suddenly the supposedly dead woman began to move...All fell on their knees. Augustina stared at Claver, and as if awakening from a deep sleep said, "Jesus, Jesus, how tired I am!" Claver told her to pray with all her heart and repent her sins, but those standing by, moved by curiosity, begged him to ask her where she came from. He did so, and she said these words: "I am come from journeying along a long road. It was a beautiful road, and after I had gone a long way down it I met a white man of great beauty who stood before me and said, 'Stop, you cannot go further.' I asked him what I should do, and he replied, 'Go back the way you have come, to the house you have left.' This I have done, but I cannot tell how." On hearing this Claver told them all to leave the room and leave him alone with her because he wished to hear her confession. He prepared her and told her that complete confession of her sins was of immense importance if she wanted to enter that paradise of which she had had a glimpse. She obeyed him, and as he heard her confession it became clear to Claver that she was not baptized. He straightway ordered water to be brought, and a candle and a crucifix. Her owners answered that they had had Augustina in their house for twenty years and that she behaved in all things like themselves. She had gone to confession, to Mass, and performed all her Christian duties, and therefore she did not need Baptism, nor could she receive it. But Claver was certain that they were wrong and insisted, baptizing her in the presence of all, to the great delight of her soul and his, for a few minutes after she had received the sacraments she died in the presence of the whole family."
22 Peter Claver: Saint of the Slaves, Fr. Angel Valltiera, S.J., Burns and Oates, London, 1960, pp. 221,222.