I have put that book on hold at my free library. The good people at the library will find and set aside the book for me to pick up. (Ah the joys of urban living - grin.) If there are additional points of interest regarding collecting, I will mention them after I have read the book.
Oh, and what about my Kayla research?
A BBC Newsround 2002 article briefly discusses the introduces of Kayla to the Barbie friends group.
And I found a web page showing the Kayla/Lea Facemold by European doll collector, Katti who shows the incredible flexibility of this facemold. Therese, take note: the Sophisticated Wedding Barbie 2002 AA might be that dark complexioned Kayla mold doll of your dreams.