Now, let me make something perfectly clear:
I wrote my book Virtually Native because I see over and over again how people waste time and money because they don't know how to learn English...
One of the most common pieces of advice is that you need to live in the country in order to learn the language and it is advice that discourages a lot of people -- NO, you don't need to live in the country to learn the language -- this is a message of encouragement.
From the few interviews I've seen I'd say that Melania Trump listening comprehension is above average for a non-native speaker. Granted, the questions weren't all that difficult, but it is usually the case that ones listening is better than their speaking.
Melania's speaking is not all that great, she is too slow and measured. Having said that, I did try to find interviews with her in her native Slovenian but unfortunately I couldn't. As far as fluency goes, I believe that ones foreign language fluency is likely to mirror their native language fluency. If Melania is slow and measured when speaking Slovenian then that would suggest she is might not be an expressive type of person... and that's perfectly fine.
And again, according to my fluency theory: not being good at using language doesn't make you less intelligent -- there are many smart and intelligent people who are not good communicators, and vice versa -- there are a lot of people who are good at using language but not all that smart.
The second thing people spend an unreasonable amount of money and time is accent. Non-native accent is here to stay and it shouldn't be something to worry too much about. I've devoted 2 chapters in my book on accent and pronunciation.
Having said that I do think Melania could soften her accent quite a bit with almost no effort and it's all about the R sound. My advice is with good intentions.
The amount of time and money people waste on pronunciation is truly staggering.
And the final point I make in the video is that it is less about the teachers and more about the time and effort you put in as a language learner.
I respect Melania Trump and wish her all the best in her new role as the First Lady of the USA.