Well at least now I know what you meant with the 'representing metal' part, I thought you were talking solely about her voice or the way she looks, my mistake
I think I get what you're trying to say (but correct me if I'm wrong) with Anette having a 'pop-history' and not exactly giving the impression to know anything about metal. Though just having sung in popband for me doesn't mean she can't be just as devoted to singing metal.
I just wouldn't put her off already, I'm pretty confident the nightwish guys wouldn't have asked her to join the band if they thought she was just some popsinger who looks good but doesn't have anything to contribute to the band.
Just because she has a history in popmusic, doesn't mean she's not genuinely interested in metal and willing to learn more about this genre. Of course that's how I feel about it, it's something you can never know for sure.
It seems to me a person wouldn't really want to join a band if that person isn't excited and motivated to start with.
Sorry for going off-topic (again...), I'll shut up now