I havent read through your whole thread, tiff, but . That was one of the reasons going back to work was not an option for me. W never did take a bottle.
How long are you away from them during the day? Any chance you can pop home for a feed in the middle of the day or have the nanny bring her to you? Have you tried a soft sippy? The person feeding the bottle skin to skin?
I'm sure there have been lots of suggestions.
I gotta go for now...