Did Juliana De Aquino (may she rest in peace) understudy the role of Elphaba? like an emergency last minute never listed understudy? because on her website, there is a picture of her in green makeup, the act 2 dress and black wig.

http://julianadeaquino.jimdo.com/fotos_gallery.php

its the last picture

http://twitter.com/JulianaAquino

and her twitter says

"Getting ready to defy gravity"

I'm almost positive that was for a concert or something.

There's an explanation under "Events":

October 2008 - November 2008
Juliana de Aquino plays the role of Elphaba at Wicked, the musical Gala in Hamburg, Germany.

She never ever played Elphaba in the official production.