I agree with Diane, offer anything that she will eat, no matter what it is. When Cujo was very very sick last year, he ate anything he wanted, if he wanted something on my plate, I gave it to him. There at the end he was eating grilled fish from Red Lobster because that is all I could get him to eat.
Big hugs to you. I know this isn't easy and I think it is human nature to second guess our decisions. Ember knows that you made your decision with love and she will bounce back from this.