Feeding on demand is recommended from birth. This helps your supply establish in the early days and weeks, and then ensures that your supply remains at the correct level after that. It sounds to me like you are doing everything right. I would say you have your milk - you lucky thing not having the engorgement! The night feeding will settle - is she feeding that often in the morning as well? What will happen over the next few days/weeks is that she will feed often during the day, and then go for a longer period overnight - maybe 3 or 4 hours. Then after a while the feeding will get a little less frequent and she will go even longer overnight. So don't worry about being up so often in the night forever!