Val- Based on your previous post I think you need to keep the NC going. You have been through so much and continue to do so and you feel this is better for you at this time so keep it up. That doesn't have to mean you are giving up or cutting the cord.
It shows that you have a hard time detaching from your W which we all do so maybe some more time with NC can lead to your further detachment from her actions.
With that being said I think you need to communicate about the Dentist thing to make sure she is aware. Try to keep it as short as possible.