day and night mix up

During the day, my LO can sleep like the wind. There is no waking her when she is ready to go down. Night, different story. Awake from 8:30pm to now so far (1:30am). I just don't know what else to do. Sh: been fed, changed, burped, clothes checked. I know there may be no answer, but any advice is so appreciated. I feel like I am going crazy. My LO is 2 weeks 2 days.