This mistress did not want to raise a brat and when she noticed that her son was headed that direction, she had to do everything in her power to stop it. And she chose to teach him a lesson by crushing and destroying his errant son's toys whenever he messed up. And she did it while he watched and she told him why she was doing it. And she did not buy him replacements. It worked.
Lady B does not like dolls. She never played with them growing up and she did not get why she had to have anything to do with them as an adult. She crushed them with her boots and she made sure that they were destroyed. She did not care whose they were. All that mattered to her was that she crushed them and she threw the pieces in the trash.