How can Angelina Jolie take part in Wanted II?

"We are working hard to wake her up. She was deadly wounded. The bullet's still there (in her head), and now it's a process of how to wake her up. There has to be a reason for that. We survive if we have a reason to live. She decided [to shoot herself], it's her decision. And now we are trying to figure out what's the motivation for her to resurrect. It's happening. I think we will make it happen"

Timur Bekmambetov - Director of Wanted