Visible crew/equipment: Near the end of the film after Depp leaves the castle after shooting Balkin and gets into his car you can see a crew member in the side view mirror as Depp opens and closes the driver side door.
Visible crew/equipment: In the scene where the man in the suit and the woman wearing all black are fighting, if you look closely you can see the string used to pull the podium holding the book.
Visible crew/equipment: When Johnny Depp meets Boris for the first time there is a crewman reflected in the glass window of the library.
Visible crew/equipment: When Corso discovers his employer's copy of the book has been stolen from behind the minibar he heads outside to catch a taxi. When he steps into the middle of the road it's obviously not Johnny Depp as the hair is thicker and skin tone is darker.
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