Who is Elaine in "The Next Three Days"?

She was a cop but I believe her scenes were cut from the movie. So if you were to watch the deleted scenes on the DVD you will see her.

for GH fans does Nazanin Boniadi as Leyla Mir looks like Brenda Barrett?

Maybe only a tiny bit, I think they look different. Hair and skin tone is about it.

are robert pattinson and Nazanin Boniadi dating?

Yes they are. Several photos of them together.