Broken keeping her on health insurance until she gets her own coverage is the right thing to do. Giving her a deadline to get her own or pay you for that coverage is the right thing to do.
This is all part of the high road path. Keep to it. Choices made out of bitterness should be tossed away. High road and tough love.
You should also do this with the car insurance. And just keep her on the life insurance but do not mention it. Only time you would take her off is if you were going to add someone else.
