That look is one of loathing, detest, spite, revenge and dick daggers.
Her only biological son with Trumpie is 14 years old, and Melania is 50 years of age, so she gave birth to Barron at the approximate age of 36 or so.
Melania, over the last decade, would have been in her sexual prime, and could very well still be. She has a lot of free time, meaning she does no work, probably never has, and is surrounded by young, healthy, fit, well built guys, who protect her, and cater to her every need. When she spent the first year or so alone in New York, after Golden ShowerBoy invaded and funked up the White House, when she travels stateside and abroad, when she took her extended Africa vacation, there is no way she's not riding some "Super Secret Service Cock". And it would most likely be one (or more) of them as if she banged the pool boy, the tennis coach or something typical like that, they'd be all over the TMZ, National Enquirer type of paparazzi mags, shows and webstites in a heartbeat, selling details for a hefty sum of cash. So it would be someone sworn to secrecy, whose career is on the line, the pride of Mom and Dad, and who would not want to bring disrepute to the Secret Service.
I mean, think about it. She's about 23 years younger than "Bouffant-Comb-Over", he's a pasty arrogant selfish putz, out of shape, never exercised, no stamina, no staying power, Stormy Daniels said he's got a short orange dick, what could be better than getting rammed by "Superior Service Dick" in a Mile High Manner, flying over the ocean on a warm fall evening? You know, the private jet she travels on has fantastic seating, comfortable couches, a full kitchen of sorts, all the alcohol one could want, it has a shower, a bed, full complement of services and plush-n-plump furnishings.
Or those lonely nights, somewhere in the far reaches of Africa, after a day of sun, sand, the mystical romantic vibe of the entire continent, after a splendid meal, a few glasses of wine, a little "Wocka-Wocka" back at the state of the art hotel room, or perhaps she was a guest at someones mansion. Up all night, lusting, wanting, sucking, fucking, getting crammed with Covert Cock.
Just saying... :)