S.C.
You shouldn't have to wake her every 3 hours unless she is jaundiced or under weight. I don't understand why you should have to wake a sleeping baby. If they're hungry, they will wake up. Anyway, unless you need to be on a strict schedule, I'd just let her run the show. When she's hungry, feed her. If she's tired, let her sleep. She's still too young to be on any kind of strict schedule. As she gets older, she'll start to develop a schedule. No need to rush anything.