I had a very similar problem to you - I never once made enough for my son, and he was a lazy eater and not inclined to work very hard to nurse when he knew the bottle was coming afterwards, anyway. I finally had to give up breast-feeding when he was 6 months old, but I fought for 6 months to feed him, and along the way, I learned a couple of tricks.
There are a couple things you can still try. Talk to a nurse or lactation consultant about setting up a system attached to your breast that encourages nursing for formula - you use medical tape to tape a tiny tube to your nipples and the formula flows through it, which reteaches your baby how to latch (the baby will get some breast milk while nursing this way, as well). During this time, you don't use a bottle even for formula feeding (once the baby relearns the latch, you can go back to bottle feeding), but you know your child is getting enough to eat because you aren't just relying on your milk. This really helped me early on (but I'm afraid can't remember what the system was called, I'm sorry) and I would absolutely talk to a doctor about the possibility.
Drink water until you feel like you might float away! Water water water constantly (and make sure you have access to a toilet!). ALWAYS pump directly after nursing your son so that you tell your breasts that you needed more than they provided, and don't stop just because you aren't getting anything.
Although it is somewhat unconventional, my mother recommended that I drink a beer right before nursing or pumping. I'm not much of a beer drinker in general, but after talking to my OB about it, I tried it. For some reason, this encourages let-down (and it really did!) and if you drink it right beforehand (or even during), the alcohol won't reach the bloodstream and milk until after you are finished, so Baby doesn't get any of it. This actually helped a LOT more than I expected.
Finally, my last little bit of advice is, if you have to give up, forgive yourself. I wanted to nurse my son until he was at least a year old, and my heart broke that I couldn't give him that. There was so much guilt that I was failing my son in my most fundamental duty to him, and everywhere I looked, people were telling me I wasn't trying hard enough. Luckily, I had a wonderful OB and a wonderful pediatrician, both of whom helped me see that I had fought every battle that I could and that I am a wonderful mother, and this doesn't change that. My son is beautiful and healthy and I did my best for him. Your daughter will be a wonderful, healthy baby, even if you cannot build up your supply further, and you're a good mother for trying your best. Good luck.