S.H.
Ahh, the pacifier...or the "binky" as it's referred to in my house. My son was the same way, he would get into a routine like sleeping through the night and then all of a sudden it would change. At that age, it was primarily due to teething. Just when two teeth would poke through, here come another two. The binky would not only sooth him, but it would also apply pressure to the areas of his gums where he was getting teeth.
For me, having my son sleep in the same room as my husband and I was not an option. I don't have a problem with families who choose to have their children in a bassinet or co-sleeper, it just wasn't my choice. However, the fact that your daughter is aware that you are in the room can possibly have an effect on her changing patterns. What I mean is that when she spits out the pacifier, she knows that you are there and will get up to give it back to her in order for her to go to sleep. Somewhere between 5 and 8 months, my husband and I had to sleep train our son. From the moment he was born, I used to rock him in the glider and couldn't put him in his crib until I ran my fingers lightly across his eyelashes to make sure he was asleep (if they don't blink when you run your fingers across, they're sound asleep). I do have to give the credit to my husband for the sleep training, though. I had a really hard time with the crying, not because of impatience, but because I just wanted to run to my son and comfort him. After about four days, he was able to be laid down to sleep, still wide-awake, and fall asleep on his own.
I am not trying to push any part of the parenting style I used with my son on you, I just hope that an array of ideas might help you get some sleep. Good luck and keep us updated!