She wasn't a bad fit, she just wasn't your stereotypical Rose which most had by that point assumed needed to be played as a battleaxe (Daly and Midler both cemented that "idea" in the preceding era and every production except for the Mendes one I have ever seen plays her this way). Bernadette was lovely and challenged those battleaxe assumptions - in vocals, stature, and performance. She was mostly successful. I will say the Mendes production was horribly hamstrung by Arthur Laurents and the more he meddled - the less "bite" the production had. I personally wanted that total breakdown with mascara running and think had Bernadette really been able to be fully committed in that direction, it would've been a frightening and dangerous side of her we haven't really seen onstage (probably the absolute most vulnerable she would have been ever). Bernadette has a carefully constructed and maintained image that I think she was trying to break, but when Laurents ordered that Mendes soften all the edges to his Gypsy, it limited her performance as well. What's sad is I think an enjoyable performance by Bernadette could've been a groundbreaking one, but she and Mendes weren't given that freedom. It's easy to see/play/stage Rose as a battleaxe belter - to do anything more nuanced is going to be seen as divisive and unexpected and may be a gamble. But, I prefer to see these classics given a complete overhaul rather than a paint-by-numbers revival. And I actually think that's a large part of why Audra Gypsy failed - it wasn't really revisionist at all.