“I knew that math was an area where I would never, ever worry about getting a job as a teacher. If you’re in math or physics or chemistry, you can write your own ticket.”
If you go into teaching for the money and job security you are going to be tremendously disappointed … which it sounds like this lady is.
If you can tell yourself that you love teaching so much that you would gladly do it for free then you might be a good teaching candidate. Then you still have to find out if you are any good at it. Being a good teacher is a difficult and under appreciated grind. If you are not good at it, you will find that it can be a humbling and sometimes even humiliating career choice.