At that age, I would follow her cues more than any schedule. If she just wants to go back to sleep after the 6 pm feed I would let her. 6-7:30 is a long stretch to be awake at that age. She may surprise you with a long night. When my DS was that age, I followed his lead (which was hard for me) and it worked just fine even when he took a long nap in the evening or had very short awake times.
Are you waking her from naps? Some people prefer to wake at 3 hours since the last meal. I am comfortable letting DS go up to 4 hours and it's worked ok. It's up to you if you want to wake to maintain a 3 hour EASY or allow some longer naps.
The hour long night feeds also happen here (although they are getting less frequent at 10 weeks). Same as with your DD - asleep at breast and wakes when put down. I find if I hold DS at least 10 minutes after he falls asleep (he usually has one big jerk and then settles back to sleep) and then put him down he stays asleep (or will go back to sleep with a bit of jiggling of the bassinet if he stirs). We also use the swing some nights.
