When our DD was a newborn, we co-slept, slept with her in the rocking chair and she also slept in her basinette next to our bed. DD didn't move into her own cot in her own room until she was 14 weeks old. Having said that she ended up becoming a terrible day and night sleeper and like Emma we went to Koo-Wee-Rup for some guidance and this has worked a treat. I wouldn't stress too much about co-sleeping or whatever works for you ATM, you, your partner and DD need sleep! Sleep is important for little ones development. Whilst our DD formed a habit of needing to sleep with us or us cuddling her to sleep, she quickly (2 days) changed and now prefers to go to sleep on her own. At this young age your DD will mostly eat and sleep. The other thing you need to consider is that she has been so used to being in a dark, safe, warm environment and now she is in the world having to get used to sleeping by herself, learning to feed etc.... ATM all she wants is to be reassured that she is safe and that's what you are doing by co-sleeping etc... with her - IMO of course!
I wouldn't 'stress' too much about it, but what I would do is be consistent and persistent. Put your DD to sleep the same way and roughly times (if you can) so that she gets used to when it is sleep time and when it is awake time. Also, your DD needs to learn to self-settle. I was told if they wake under 1 hr of sleeping, then they need to be put back to sleep. So you may need to pat her/rock her, sing to her - whatever ATM until she self-settles. If she is crying, pick her up, but if she is just cranky, then try to encourage her back to sleep, just make sure she isn't hungry or wet! Good luck, enjoy these times co-sleeping and what-not, it goes so fast. BTW my dd is now 5 mths and sleeps 2 hrs in the morning, 2 hrs in the early arvo, then another 1 hr or so in the late arvo then sleeps through the night from 8pm until 7.15am.