It seems like what you're saying is that she doesn't look big enough to be curvy.  But curvy is not about size; it's about proportions.  Being bigger doesn't always mean being more curvy and being smaller doesn't mean being less curvy.    Here's an example of someone who's slim and not curvy.     Here's an example of someone who's slim and curvy.     Here's an example of someone who's fat and not curvy.    Here's an example of someone who's fat and curvy.