I've seen a number of Emily's films and no matter what she plays I always warm to her character... I think that adds to the girl crushness because if she was a total bitch I probably would go off her. I've seen her on numerous interviews too and she always comes across natural and down to earth :))
If you haven't seen Wild Target which is a film she stars in with Rupert Grint (a boy crush of mine) then please do! It's sooo funny! Very British sense of humour is needed for it though... it's one of my favs!