She was an extravagantly slender girl. Her ribs showed. The conspicuous knobs of her hipbones framed a hollowed abdomen, so flat as to belie the notion of "belly." Her exquisite bone structure immediately slipped into a novel - became in fact the secret structure of that novel, besides supporting a number of poems.
The character described is portrayed as exceptionally thin, with her ribs and hipbones visibly outlining her physique. This striking physicality conveys a sense of fragility and purity, emphasizing her delicate nature. Her flat abdomen is so pronounced that it challenges conventional ideas of bodily shape, adding to the ethereal quality of her appearance.
Moreover, her remarkable bone structure transcends mere description, becoming a pivotal element within the narrative itself. It serves not just as a visual detail but as an integral component that enriches the story and inspires poetic expression throughout Nabokov's work, demonstrating how physical traits can influence literary themes.