"This is, like, the third time I've seen the movie and it still makes me cry," the contactmusic.com quoted the 22-year-old as saying. "I had to run out and try and fix my face for the Q&A because I was such a wreck" after the premiere Sep 10, she said.
This will be the young actress' first movie after the "Harry Potter" franchise where she will be seen doing a prominent role. The film also stars Logan Lerman and Ezra Miller.
The film is slated to release Sep 21 in the US.