Yes, she has. Then she was cast as the lead in "Head-on" which was quite successful. And then some tabloids picked up the whole porn actress past and basically started a campaign of smear articles about it, which led to quite a bit of public sympathy and support for her, a reprimand from the "Deutsche Presserat" (a self control institution of German media) against the tabloids in question and her parents breaking off all contact.
Since then she has been doing very well as a serious actress, and I really think she'll make a wonderful Shae. Martin commented on her audition tape:
All of our Shaes were hot as hell. But only a handful of them captured that other quality, maybe three out of twenty, and Sibel was the standout. It's easy to see why she has won all those awards. Watching those auditions, any red-blooded male would want to take every one of our Shae candidates to bed. But Sibel made you fall in love with her as well.