The Dark Tower Casts Role of Tirana

It seems the movie adaptation of The Dark Tower is very very slowly moving forward. Deadline is reporting that Abbey Lee (Mad Max: Fury Road) has been cast in the role of Tirana. The character is described as "she’s sexy and dangerous, she has fake human skin and cold snake-like eyes. She doesn’t come in until the seventh volume, apparently, but she’s going to be starring in the first film." I read the seventh book and I don't recall the character. Based on looking at various Dark Tower sites, she apparently an incredibly minor character described as "A low woman in the Dixie Pig." The use of the name could be to clear any legal problems (yep the names of characters in movies and TV have to clear legal hurdles cause people will sue claiming "that is me"). My theory is the name is a fake-out and she was really cast in the role of Susan Delgado who was the first girlfriend of teenage Roland Deschain (the lead character of the Dark Tower) but only suggesting that because there really isn't a character (or a combination of characters) that fit the description above in the books that I can recall.