Most babies have an irritable time of the day (often in the evening) where they just want a cluster of feeds. This is completely normal baby behaviour, but some-times it's read as 'she's hungry and I don't have enough milk = top up) Be prepared to feed her frequently. If you can grab a few days where you can just stay at home and feed her whenever she want it will do fabulous things to your milk supply.
With DS1 I bowed to pressure because I "didn't have enough milk" and gave him formula. With DS2 I was much more informed and had a wonderful MCHN (who was also a lactation consultant) and we successfully breastfed for nearly 14 months - I was aiming to get to 6 months!

During those times when my LO wanted to cluster feed I practically had my boobs out all day so he could just feed, feed, feed. This would go on for about three days at a time then he would slip back into the more regular times of feeding.

BTW, some awesome advice on this thread ..... you ladies should all pitch in and write a book!

Oh and, need I say it? I think you're doing a wonderful job!!