Did Mary of Teck steal objects she liked?

Yes. Queen Mary would go to someone's home, admire something she liked and already had in mind, and then she would stay until she got it. She would make it perfectly clear that she wished to be presented it and then simply sit until the host or hostess made a gift of it to her. She visited shops with the same intention in mind. There are claims that she took things from people's homes without their knowing it. Essentially, she was a thief and a big one.