I'm as against the "beautiful at any size" bullshit as most people are. But models starving themselves and being praised for it isn't any better. My high school girlfriend fell into that trap and it wasn't appealing to me. Skinny eating disorders are just as bad as fat eating disorders.
Looking at this rough guide below, keep in mind that many women in that 15-17% body fat range are going to have amenorrhea - a condition where they have irregular or even zero menstrual cycles. Society might think of them as "fit" or "athletic", but if their hormones are in a state where they don't have regular body functions, are they really healthy? Obviously the model in the image below lifts weights, so she's probably eating healthy as well. Most women in that body fat range won't put in the work, so they're going to be worse off health wise.
The 20-25% range is what's actually healthy and sustainable for most women if they eat right and exercise consistently. A few women at the tail ends of the distribution can be healthy at the 15-17% and 26-30% ranges.