I'm not sure what use being able to speak Slovenian is worth since there are two million people there and even Europeans confuse it with Slovakia which has 5.5 million or so assuming they even know where it is.
She probably did do this as Trump's older kids tried reduce any inheritance Tiffany Trump might be entitled to. He talked about this on the Howard Stern show so why not exclude Barron also? Trump famously withdrew family funded medical care for his nephew's sick baby as Trump (you know he did) manipulated his own father's will.
https://www.independent.co.uk/news/world/americas/donald-trump-revoke-cut-off-child-medical-bills-family-feud-a6795131.html?amp
Melania and Trump were always a business arrangement and she is also a flagrant liar. First Ladies get loads of honorary degrees, she has none it seems from Google search. This is because universities can't really give one to someone who has committed academic fraud and she does not want to draw attention to this either.