Some liberal Twitter users think Stephen Miller had her wear it as a distraction. Because they're idiots. I also found your theory which I find more believable
It hadn't occurred to me that Melania Trump would listen to Stephen Miller. Frankly, it hadn't occurred to me that they would ever be in a situation where they might communicate. Now that I've been forced to grapple with the idea I'm not left convinced of its plausibility.
So liberal conspiracy theories are not at all entertaining. I need some gay frogs and fish people in my conspiracies. I've seen it posited that even her plagiarized speech was intentional and meant to stoke outrage. Every misstep is a calculated attempt to outrage the left. Either this woman is entirely complicit in all decisions made by her husband and his circle of stupid or she has no agency in her life at all. It's not possible she's a flawed person in a situation she doesn't know how to deal with and is completely unprepared for even at this point. Y'all some woke motherfuckers indeed.