She has nothing lined up after Phantom. Maybe thats because she doesn't want to, but alot of people have critcised her for her acting. She has the same facial expression in pretty much every scene, there is more to acting than just reading lines you know. There are times when Christine should have looked frightened but she just looks gormless.
All that being said I can see why she was cast because she looks the part and Hollywood isn't exactly crawling with young actress' with classicaly trained voices. The ALW version of Phantom is very much focused on Christine because he wrote it as a vehicle for his then wife, Sarah Brightman. In the stage version that Phantom doesn't really appear in person that often. The sympathy I feel for the Phantom is because of the awful life he has led and the way he has been shunned by society which is why he turned out as he did. He loved Chrstine but doesn't go about wooing her the correct way.