I know it can be scary, but you need to calm down a little. Sometime little ones do better taking bottles from people other then mommy. If the little ones can see, smell or hear mom, they will want mommy & the nursing section, so if there is any way someone else can talk over the feeding for the 2 days - it might be helpful in getting her to take the bottle.
Plus, since the bottle is kinda a new thing, try not to let her get overly hungry before trying to give her the bottle. Sometimes they are more willing to try new things if they aren't so hungry.
So, you know babies are very smart little things... she will quickly learn it's this or nothing. Even if she is just taking a few oz at a time... she is getting what she has to to keep hydrated... just watch the diaper count like you did when she was littler & if they are normal - all is good.
Also, maybe ask her doc about other liquids that she might be able to drink instead of just milk. Maybe she would be more willing to drink them - if you are more concerned with the hydration part of the situation.
I with you luck w/ you procedure & your little girl!