I think you’re in a pickle. If you did leave her and divorce her, the child support you would have to pay would be worse financially than the one income family situation you now face. Add to that the emotional distress you would endure being without your children on a regular basis, and it just doesn’t seem like a viable option unless you get to the point where you truly can’t stand being around her anymore.
Perhaps, in time, when she sees how her family’s financial situation is so negatively impacted by her being jobless, she will reconsider.