N.N.
I was obsessed with my newborn's sleep and dove into books, solicited advice, and camped out in blogs, chat rooms, and massage boards. I'm no expert but here are some of my tips:
1. Have a bedtime routine. It's not too early to start. Routine and familiarity are a comfort to babies. Bath, lotion, rock to soothe, and into the crib. There were ALOT of bumps along the way but all worth the extra effort a few months down the road.
2. Sway (sideways or up and down), swing, rock, cradle. Do wwhatever it takes to soothe your baby.
3. Hold your baby until she is drowsy but not asleep and place her in the crib. Babies will want to wake where they fell asleep. If she falls asleep in your arms, then that is where she will want to stay. I learned this the hard way.
Other tips that I've collected from other parents:
1. Sleep on her crib sheet for a few days to have your scent on it. Then at night, lay her down on that very same crib sheet.
2. This is part of the routine suggestion. Use a sound machine to help her go to sleep. People use blow dryers, vacuums, etc. I purchased a sounds machine on Amazon. Babies are not used to the quiet since inside the womb there is constant noise.
3.Temperature: Is the room too cold/hot for her? Is she dressed warm enough?
I think she maybe too young for crying it out. I agree with the other posts, maybe she has her days and nights mixed up.
Also, we maybe be able to help you out a little if you describe the difference in how you handle putting her down for naps versus bedtime.
Good luck with the trial and error. Keep us posted.