Since Melania Trump was a reasonably successful model, it's actually not difficult for her since she could probably easily satisfy 3 of the following —

Evidence of published material about you in professional or major trade publications or other major media

Evidence that you have been asked to judge the work of others, either individually or on a panel

Evidence that your work has been displayed at artistic exhibitions or showcases

Evidence of your performance of a leading or critical role in distinguished organizations

Evidence that you command a high salary or other significantly high remuneration in relation to others in the field

Evidence of your commercial successes in the performing arts