Hi, I understand your situation. You need to visit a psychiatrist as soon as possible. But as she is not agreeing, you go to the psychiatrist first, talk about her situation and take doctor's advice.
Sometimes, we need to take patient by telling lie. If required, you too need to do that.
But I would recommend you to consult a psychiatrist soon.
Next Steps
In this situation, it is important to take care of yourself and your kids too. Kindly do that. For the time being, try not to counter her as much as possible. It might help you to start her treatment soon.