If you're feeding regularly through the day, I'm not sure what else you can do apart from wait and let bub adjust.

Some things that might help are making sure the room is dark and quietish at nights (maybe some soft noise might help stop any sudden noises from startling her if that's the issue), and then during the daytime let it be a bit noisier and perhaps the room she naps in not quite so dark, to help bub figure out the difference between day and night?
Do you wrap bub for sleeping?