Yes, that’s true but it’s not what I was trying to describe. (Clumsy words.) She makes the sketchy drawing FIRST and feels her way around the forms to get it to materialize into an image. Just like with anybody else doing a sketchy drawing, “false starts and hesitations” are part of the process and the end result is scribbly looking and gestural. (Duh). So when she gets to the next stage - the drawing print on the watercolor paper - it’s just a way to refine and clean up her messy drawing.
Her “sure hand” starts at this point when she’s able to retain the freshness of the sketch, correctly build up the tones of the ink, knows where to place the light and dark parts, senses where to sharpen or soften the pencil lines, and understands the shape and placement of the highlight.
Simply, she knows what she’s doing...skills+experience.
That’s all.