My dr told me that once my son had double his birth weight I could stop waking him up. But he was a premie and was only 5 lbs 14 ounces at birth so it might be different.
I would just let her sleep. She will get into her own routine soon. But if she's still not sleeping through the night like when she's a few months old then that's when I would start trying to keep her awake during the day for longer periods of times.
Whatever your comfort with but I feel like babies will always tell us when they're hungry after having a set feeding schedule for a good amount if time.