Breastmilk supply issue

Okay, baby girl is 4 weeks old and until yesterday I was solely breastfeeding. She has plenty of wet diapers, dirties are few and far between. She hasn't gained much, so far she's up 1oz. At night she seems to almost cluster feed, like a 6 hour window and she seems to want to just go back and forth from one boob to the other and back. She has Amazing latch and Strong suck, so the first 2 weeks she actually gave me blisters on the ends of my nipples, so I feel like I may have cut a lot of her feeds short when she would drift off to sleep because of the pain.

Today I have tried feeding every hour and a half to two hours, plus drinking water like crazy, and I picked up lactation cookies at the store today. I even woke her up just to feed, (I'm also trying desperately to get her clock changed, her night and day has been backwards for a while) Is there any thing else I can do to help my supply catch up to her demand?

Thank you ladies!!!