I don't know about her versatility, and I have seen in her various television and films, but what she brought to Audrey can never be understated, IMO. Just seeing her performance in Hey, Mr. Producer, was like the ultimate showcase of the relationship between actor and role just being utterly perfect in every way. I don't know the story really, but Ellen Greene just understands Audrey so thoroughly and brought things out in a way that seems like only she can, and it's not just because she originated the role and we're just used to seeing her version of it, it's something more.