That's actually something I liked about the show. Someone so stubborn about their opinion and is forced to change it because of circumstance. If there was anything that I liked about VOY and that I disliked about other trek series, it was that. Granted, it got a little annoying when it was all the damn time.
Still, I can't recall too many inconsistencies in her decisions, or at least ones that went "UGH WTF"