What I would try:  
1. Using that supply line at the breast, that she's now finger-feeding with.  As soon as the baby latches, give him a little gush.  Instant gratification and a flow that the baby recognizes.
2. In our office, if a baby has been almost exclusively bottle fed, we find that we might have to start from where the baby is.  The baby is now used to the feel of that bottle teat.  Trying a nipple shield, with the supply line behind it to give some instant flow, can definitely coax the babies back to the breast.  Eventually it can be discarded, but the baby would at least be feeding at the breast and learning  there's food there.  
3. (Should have put this first, but it's early so I'm still groggy...) Plenty of skin to skin with the babies tummy to tummy with mom, upright between the breasts, mom semi-reclining, no pressure for the baby to do anything.  That keen newborn sense of smell should guide them to the breast. 
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