You are EPing, right? Does she need a bigger bottle? My son is one week older and we just increased his bottles to 4oz which seems to help him sleep longer. And we'll be sure to offer a little extra between 6 & 8pm though he usually shows he's extra hungry then anyway.
I wonder if im doing bottle feeding wrong. After each pumping session I leave 2- 4oz bottles out and dd just eats whenever. Sometimes she just snacks on an ounce here or there or like right now she just ate the whole 4 oz in one sitting. (Which is rare). Should I be offering a bottle at more set times? At this point she just kind of grazes all day and I do end up tossing a lot of uneaten breast milk down the drain.
I would try to not let her snack. Mine ate every 3 hours during the day. In the evening I would cluster feed - bottle at 5, snack at 6ish (I would let them drink whatever which was 1-3 oz) they'd take a cat nap, then final bottle at 730. Eventually they cut the snack and evening nap but that got us a good stretch till 2 am when I started that.