Here's what The Daily Mail says about it:

"Sam Mendes has shuffled the ensemble for the second season of his Bridge Project because actress Anne-Marie Duff has had to withdraw because of an illness in her family. Juliet Rylance will now play Rosalind in As You Like It and Christian Camargo will play Ariel in The Tempest - both roles Anne-Marie was going to tackle. If you want to see Anne-Marie in action, check out Sam Taylor-Wood's superb movie Nowhere Boy, in which she fearlessly portrays John Lennon's mother Julia, when it closes the London Film Festival. Watch her sit on the lap of her son (played by Aaron Johnson) - the anger flashing through the eyes of mother and son is extraordinary."

http://www.dailymail.co.uk/tvshowbiz/article-1220758/The-hot-ticket-starring-Keira-Knightley-thats-million.html

Very disappointing news. image Wish her all the best.