That is wonderful to hear, that your little girl is doing so well. My son is the same way! I think the book that you read is the same one that I have. It is a 4-7 feedings a day. If you are only breastfeeding then six or seven. If she starts rice cereal (talk with your pediatrician first) then three will be supplemented with cereal. Breastfeed then offer cereal. With all this said, read your baby. If she doesn't do well on this schedule, she may not be ready for it yet and you can gradually adjust. There is nothing wrong with the schedule your on.
You are doing a great job, I have gotten a lot of criticism for not doing demand feeding only. The eat, wake, sleep method has worked so well for me and a lot of other people I know. My child is not starving and he is on a 2 1/2 to 3 1/2 hour schedule. He sleeps all night, and has been since seven weeks. He is three months old and weighs 16lbs. His eat, wake, sleep pattern changes. He right now doesn't want to nurse that long, and is dropping feedings on his own.
Hope this helps!!