She's got a quality of preciousness about her
It seems like every time she opens her mouth in a film, she has the gentility of a little girl in her voice. Doesn't she just have such a cute voice?! That, coupled with her smile and the gleam of glee that is often in her eyes, and you have the very definition of a sprightly woman! She's just precious.
Please excuse typos/funny wording; I use speech-recognition that doesn't always recognize!