User blog comment:27finnsprincess/The Talk About Marcy and Ice King.../@comment-5616361-20121018015343

My theory is that Betty sought out a magical item like the Ice king's crown and became "Doctor Princess" since he calls her his princess in "holly Jolly Secrets 2". And in the chamber of the frozen blades she says that princess is a surname. Also, she disguises herself as Science Whyzard. I think she wanted to keep an eye on simon so she became a wizard.