Don't forget that Melania has a teenage son that I believe she would do anything for. Imagine being in her shoes as a human being who never wanted to be first lady and who under her particular circumstances, would absolutely lose all custody of her child if she chose to leave her husband for any reason.
I believe she may be trying to do the best that she can given the situation she's in. Like all of us, she may not always take the right steps, particularly as she has no political experience, little real higher education and few good people advising her. But I see her trying, defiantly, where she can.