I read her blog. It seems like a huge deal to her to sing for Nightwish. Can only take so much out of text but if she's as genuine as her blog shows then they better keep her. I really do believe she's perfect for the band.
After seeing her live with them, I think so too. Considering their prior history with singers, they need someone who is strong enough to not only sing the material, but also hold her own against the sometimes rabid Nightwish fans.