B.S.
2-1/2 weeks is still very young--though I know you're feeling exhausted and wanting some much-needed sleep. Have you tried to keep her awake in the evening? Don't let her nap, just keep playing with her and talking to her and moving her and wiggling so she doesn't get comfortable and fall asleep. (This is hard to do--you will SO MUCH WANT to snuggle a comfy sleeping baby.) If you get her to be awake more in the evening, then when she has the last night feeding she should be good and tired and sleep for awhile. But if you let her fall asleep between 9:30 and midnight feeding..she probably won't. (JMHO)