Other mistake: Toward the end of the movie, as Johnny Depp and his leading lady are being led down into the dungeon, you can actually see the camera bouncing and shaking and hear it hitting the stairs as it moves down the stairs.
Other mistake: When Corso returns to Baroness Kessler's office he places his photocopy of the first engraving next to her book and you can see that the captions are not the same, yet neither of them notices. (01:24:15)
Answer: She was not given a name, neither in the film nor credits. She is simply known as "The Girl". As to precisely who she is, it is deliberately left ambiguous. But the last engraving found by Corso does seem to indicate that she is the Whore of Babylon mentioned in the Book of Revelation.
Twotall