My DS goes red in the face and starts wriggling when he's got wind :P Maybe try massaging her tummy? Get your LC to show you how to do a tummy massage to relieve wind - it's hard to explain :)
Do you hand express a bit of milk before feeds? Maybe that would help with the let-down. Or try massaging your breast as she's feeding towards your nipple to stimulate the flow.
Hang in there! My DS breastfed 3 times today (he's got breast refusal) so I'm stoked. I was also close to giving up but my wonderful baby whisperer LC worked his magic again today and has given me hope.