Hi Suzi
Our son sleeps in the middle of us. He uses our doona but I know some people put the bub on top of their doona and give them their own blankets, if you think she is likely to slip underneath the doona then it would be better to do this. He sleeps on my arm and doesn't move but if he starts moving around he will be moving on top of the doona. I dress him in a singlet and wondersuit. I have sleeping bags but I find he is warm enough in our bed without it. May just check if she is warm enough if you wake up or stir. Alot of the sleep bags are meant to be really long, as long as they can't sink into it they are fine. Good luck. I hope you get some sleep soon.