@Hiraelle She's never said to be dead, just "unmoving" after Trelawney saved her from Greyback and I don't think Rowling has said anything about her one way or the other either? I cant be too sure though... but in the books she's just "unmoving".

And as far as I'm concerned; what the actors/directors/producers of the movies say happened is irrelevant. Like you said, they're not canon.