If I ever met her I’d be tempted to ask if her feet hurt. Just don’t know how she can stand very long in those not to mention walking on grass like I’ve seen her do.
The heels are that high because it appears she has long feet. Someone with a size 7 foot absolutely could not wear heels that many inches high. I remember reading that Jackie Kennedy’s shoe size was 11, and Melania is even taller than Jackie was.
Even with that advantage, Melania’s heel choices are the highest possible. She demonstrates seamless gracefulness walking on difficult surfaces in them. She is an athlete of her craft.