Wearing a jacket with a message saying "I don't care, do you" on it to a detention camp is a very weird choice.
But all the people saying it's a message about immigrants, or a message about her feelings on her marriage or whatever else is... stretching it a bit.
She's a woman who isn't known for her towering intellect and is stuck in a marriage to the orange one. She never wanted to be first lady. She has been dragged into stuff she has no interest in.
So she's grabbed a coat without pausing to think about it, and been seen wearing it before someone could provide something more appropriate. It;s not a message. It's the actions of someone fairly dim and uneducated, and who doesn't understand the political game.