That’s her big shoulders and awful posture and carriage.
Look at her calves in the picture (which is Photoshopped, btw. She did wear that outfit to meet the royal family of Spain, but Mrs. Sarkozy wasn’t there and Princess Letizia was in a different dress.) They’re not any bigger than the other ladies’. Most of her problems are fixable with a change of clothing and movement.
No, she’s never going to have a bone-thin white woman’s butt, but neither are the vast majority of black or white women.
Her looks and physicality are the least of our worries.
Check out the length of her arms compared to the two absolutely gorgeous, normal people. Her arms are at least a hands length longer than theirs if you look at the length compared to the wides part of the hips.
Her problems are not fixable but could be made better if she dressed correctly. Her posture is just out and out horrible. She’s always hunched.