She will not eat for at least two or three days - it is worrying but the worst thing you can do is show any reaction.
She has to make the connection herself that food has no power over you. As you can't bark in a way she will understand it is your body language that you have to rely on to convey the message.
It hinges on your ability to TOTALLY ignore her - she will see you taking a sneaky look at her, even when you think she is not looking.
I know how hard this will be for you, but it is crucial.

I wish you all the luck in the world - something written down seems so easy, and to people that have never done it - it looks like a simple solution. I know it isn't - especially when you are already worried about the health issues.

Stick with it and she will eat.

Make sure that after you lift the food bowl and have the ignoring period that you interact normally with her until feed time comes round again.

Well done, be strong and remember it is for her own wellbeing in the end.