 Green portrayed the witch <unk> <unk> in the 2007 film adaptation of The Golden Compass . She found it difficult being flown on a harness because of her fear of heights , which led her to refuse to reshoot a scene on her last day of filming . Green hoped the religious themes of the book would be preserved , but references to Catholicism were removed from the film . Green next appeared in Franklyn , as Emilia , a woman whose multiple personalities are split between tormented artist ( which Green compared to real @-@ life figures Sophie Calle and Tracey Emin ) and another , which she described as , " full of life , very witty , big sense of humor " . She also filmed Cracks , the directorial debut of Jordan Scott , Ridley Scott 's daughter , where she plays a mysterious teacher at a girls ' school named Miss G , who falls in love with one of her pupils . In March 2009 , she appeared in Womb , where she plays a woman who clones her dead boyfriend . It is a collaboration between actor Matt Smith and director <unk> <unk> . 
