I was really torn on whether to say anything because I am new to this forum and I don't know the community very well, but I slept on it and still felt very uneasy when I woke up so I'm just gonna drop my
I have a large circle of friends who are former abuse survivors that talk very openly about their experiences, and the behavior your MIL is displaying is disturbingly close to classic warning signs, enough so that it set off my alarm buttons (the threatening to break things part especially). I thought maybe she was just worried that larger food would harm the snake and was perhaps over reacting, but "wanting the snake to stay small" is not even remotely close to a good reason for poor husbandry, and now I'm very worried for the animal in her care. As a keeper and animal lover, one's primary concern should be for the health of the living thing that relies on you (general you here, you-you seem to have your priorities right). If she wanted a small snake, she shouldn't have gotten a BP. If I admitted to something like not feeding my kids/dog/cats a proper diet in order to purposefully stunt their growth, they'd be rightfully taken away.
I might just be me jumping at shadows because I've been train to be hyper aware of certain patterns, but please, look out for your snakes and look out for yourself.![]()