To be a nice person is not a qualification for employment. Employers don't care if your aunt is very nice or the opposite in character.
1-Does she have the qualifications?
2-Is she state certified?
3-Did she complete the student teaching requirements?
4-Did she major in education?
See my point?
The topics you mentioned
are needed in areas such as engineering, astronomy mathematics, architectual work and people planning to become math professors.
By the way, high school math teachers also teach the topics listed above at a high school level, of course.