Personally, I find nothing wrong with it. My first association was not with
Melania Trump, despite knowing of her, and I doubt a lot of people would think of her right off the bat. Furthermore, I assume what you dislike about
Melania Trump is her views and/or morals. If that's the case, if your book showcased her morals, it would be an issue, but I doubt it will. And if it clearly does not, then it won't matter that there's a character named
Melania.
Melania is, after all, a name. Not a type of person. I've read stories before with characters named
Adolf that didn't turn it into an issue. However, if you want to play it 100% safe, you may want to change the name.