She was an English major in college. She didn't take a math class her senior year of college. She took a CS Elective to fulfil her math requirement in college (that's where we met. The class met once a week and a different Grad student or Professor would give a talk about whatever project they were working on. Over the course of the semester we would have to write a page "report" about 3 of the talks we heard)
So, she graduated, then got a Masters in Education and then started teaching (among other subjects) Math to 9 year olds but she hadn't taken a math class in 6 years.
She not only didn't like math, but she actively avoided it for over half a decade and then she was tasked with teaching the basics to kids...
Part of the problem could be that there are lots of teachers like her, that don't even know how to do the math themselves.