Betty saw the flaws in her parenting for her child that didn't know she even existed, she didn't know what to do when the Mushroom War started and couldn't protect you since you were a baby.

She couldn't even remember Simon, nor can he even parent you when he's Ice King so you had to endure loneliness until you gotten older to have friends or parent figures to feel complete like a family.

Betty was wearing Magic Man's hat and some dirty darkish green coat as she hid between some bushes to see how you were doing. She didn't want to interact with you. What if you lashed on her or blame for her abandoning you? Betty didn't want you to think of her like that but she's for sure it felt like that for you.