I think babies/kids are pretty clever and in most circumstances won't let themselves starve. I'm guessing when she realises you just aren't there she'll adapt. shew may not drink formula or cows milk but she may start eating more. my personal preference (if it was me) would be to feed before and after work still.

ignoring the fact that they really do have to provide facilities for you to express, you may need to hand express at first for your own comfort. you may want to drop a feed each week from more until you go back to work as well.

sorry, I'm not an expert but that's just my suggestion! barb or someone else will have better suggestions!