Working on it,
Don’t pressure your wife (even in the slightest way) to work; let her do what she wants. She will eventually work more, but pressuring her will backfire and create resentment. It sounds that she is distraught already that your business is not bringing home enough money. Try to create a calmer atmosphere. She will respond in kind. Apologize if you have been pressuring her, and make it short. Talking too much about it can lead back down that path of negativity.
If she is working in the public school system, I can understand her being picky. A new teacher/councilor/etc in the public schools often get the least favorable neighborhoods and/or students.
BTW, what is your business? Maybe some of us can offer ideas on how to grow it.