Oh Luce. Kendall is tall and lanky and maybe less than 5% of population of women stands a chance to look like her. I sometimes find images of very slim people a bit triggering (I am short but a bit curvy) but I do not go on the internet to share my insecurities with strangers.
Also, whether Kendall maintains her model figure in a safe way (good diet, exercise) or not (skipping meals, diet pills, drugs etc*) is another story.
*I don't follow the Kardashians/Jenners so no idea if that could be why Kendall is so slim, just speculating