Most of these have already been mentioned but:
Alternate the cot sheets so you're always wearing/sleeping with one so it picks up your smell. Even drip some breast milk onto it where her head will be (and let it dry!) so it smells of you.
Arrange a blanket that's been rolled up like a sausage into a U shape that forms a snug 'nest' for her. It should be from shoulder to shoulder so there's no chance of her face ending up against it. If you lay her down so her feet are making contact with the bottom of it she'll feel more secure.
Swaddle her. Those giant muslins are good for this. Alternatively you can get swaddle bags that do it all for you. Just be sure that she's completely free to move her legs. I personally don't like the method of pinning their arms by their sides - in the womb their little hands are right up next to their face so this is familiar and reassuring, and she can even suck on her hands for comfort if you swaddling her so she can reach them.
Warm the spot with a hot water bottle before you pop her down. Obviously remove it completely when she's in there!
Definitely use white noise if you aren't already.
Lie her down awake. Stay with her and pat or rock her, SSSHHHH (much more loudly than you'd think you need to!) or breathe deeply next to her ear. If she falls asleep in your arms she will be unsettled to wake in her cot - one book I read likened it to us falling a sleep in bed and suddenly waking up on the kitchen floor!
Power through! The world is new and overwhelming and alien to her at the moment. Do what you've got to do (following safe sleep guidelines of course!) for the next couple of months and worry about routines and bad habits when she's older.