Aside from the affluenza you already cited, how would she even be in the running with her thick foreign accent, her foreign understanding of American metaphors and stereotypes? Doesn't sound 'Merican enough, she's too old for them and also not blonde (thought that can be tweaked).
I think Ivanka would be a better choice if your aim is to expose the room temp IQs of that clan. Melania is just a gold digger, true, but being able to speak 5 languages doesn't generally strike people as pathetic.