I am not sure I fully agree with this take, but even if we do say her character does not change at all, I don’t think it’s a flaw or an issue. At least it wasn’t for me.
In general Disney animated classics haven’t always had crazy character development, nor is it entirely necessary for this type of film. Not that it doesn’t hurt, but I don’t think there is a hard or fast rule.
When I think of the classics, they showcase characters overcoming an obstacle, adversity, a challenge, a foe. Good vs evil. Sometimes teaching lessons along the way.
This movie to me felt like a call back to the more simplistic storytelling that made Disney famous, while still having twists and turns, a great villain, and several heartwarming moments.