The Life of the Blessed Virgin Mary:

In the afternoon, when her confessor again asked her for the names of the three holy kings, she answered, Mensor, the brown-faced one, after Christ's death received the name of Leander on his baptism by St. Thomas. Theokeno, the old, yellow-faced one, who was ill when Jesus visited Mensor's camp in Arabia, was baptized Leo by St. Thomas. The brown-skinned one, who was already dead when Jesus made His visit, was called Seir or Sair.' Her confessor asked her: How then was he baptized?' She answered smiling and without hesitation: He was already dead and had received the baptism of desire.' Her confessor then said: I have never heard these names in my life: how then did they get the names of Caspar, Melchior, and Balthasar?' She replied: They were called this because it goes with their character, for these names mean: (1) He goes with love; (2) He wanders about, he approaches gently and with ingratiating manners: (3) He makes rapid decisions, he quickly directs his will to the will of God.' She said this with great friendliness, and expressed the meaning of the names by making pantomimic gestures with her hand on the bed-coverlet. It must remain for the language experts to decide how far these words can be made to bear these meanings.

https://biblehub.com/library/emmerich/the_life_of_the_blessed_virgin_mary/xiii_the_journey_of_the.htm

It isn't clear whether it was directly revealed to her that Sair received a baptism of desire or whether she made the inference herself.

I would assume she wouldn't be speaking with such confidence if it wasn't revealed for she was usually shy and timid.

Honestly... I find the book weird so far. It has already claimed that Christ was born on the 25th of November and the Annunciation on the 25th of February, both a month earlier than the Church celebrated. Furthermore, there's a weird statement that Christ was born 8 years prior to what we count from and that the first four years of Christ's life were completely forgotten. What does that even mean?

What puzzles me is that her life was full of miracles and she had the stigmata and all, her visions didn't contradict anything in Scripture even though she never read it and yet I don't get it how the Church could get all of these things so wrong. I realize why the Church both didn't condemn and didn't canonize her but I somehow expect the books would be put on the Index if they were harmful but they must've gotten an imprimatur instead.

https://en.wikipedia.org/wiki/Clemens_Brentano
Recall that he was a poet and a novelist, so some embellishment is highly likely.

The Mystical City of God by Ven. Mary of Agreda is definitely trustworthy and has been approved by numerous Popes, saints and highly esteemed theologians for hundreds of years.  (My old copy has about 15 pages quoting a the numerous approbations over the years.)

The same can not be necessarily be said of the revelations of Anne Catherine Emmerich.  I person believe that she was a good and holy person.  The problem is the man who wrote and published her revelations was a protestant and surely embellished and changed things.  So, we don't have trustworthy writings for her.

There are def problems with her writing, it was condemned by Pope Urban VIII in 1625, the congregation of the inquisition in 1681 and Innocent XI forbid it from being read. Then the censure was confirmed after a more careful thirty-two session study of Croset's translation. Only thing going for it is that the decree of Innocent XI was suspended for whatever reason, but only in Spain. Any further requests to suspend the decree was ignored.

Either way, the book is obviously suspect. If something getting that much censure and kicking up controversy amongst theologians isn't suspect then I don't know what is. The statements which the reports present on the Catholic Encyclopedia are pretty sketchy to say the least. I'm not sure I would call it safe by any means like how one may call "The Imitation of Christ" by Kempis safe.

https://www.newadvent.org/cathen/01229a.htm

If I had known that I wouldn't have bought the book.