A.A.
All these ladies have great advice! One thing that I do for my girls is have a bedtime routine. It helps them know what will happen next. We happen to brush teeth, get in pajamas, read a book and then they turn out the lights themselves now (when they were babies I held them while I did it), and I say the same thing as I tuck them in and leave the room.
I say,"It's time to... turn out the lights and say good night, sleep tight, and remember... mommy loves you". I say it in the same tone, using the same pattern of speech every time. And then I close the door and rarely go back in, unless they're really distressed. If you wanted to do this, you could, of course, say anything you want, as long as it's the same every night.
Both my girls slept in our bed until 2 to 6 months. They always took naps alone. Lots of times for naps, I'd nurse them to sleep, side laying on a little blanket nest on the floor so that they wouldn't feel it when I got up. Maybe you could try getting her alone for naps (if she isn't already), that way you aren't desparate for sleep while trying to get her down.
Another thing I've noticed about young kids is that they can tell how you feel, just like a horse knows when you're nervous. If I ever put my girls down to bed with apprehension, hoping they would stay down, they were on to me and usually crying before the lights were out. I found it was best to be calm, confident and matter-of-fact when putting them to bed.
I hope your household is sleeping soundly soon!