C.L.
We used the "bottle fairy" trick to get rid of the bottle. Maybe it would work for the pacifier? We packed up all of the bottles in a shoebox and left them out overnight. The next day the box was gone and in its place the "bottle fairy" had left a new engine for my son's Thomas the Train wooden train set. It might help to decrease/limit her use before you get to that point though. Maybe try to get her down to just using it at bedtime? When we did the bottle fairy thing he was down to just a bottle at bedtime.
I wouldn't recommend having the child throw it out the car window as apparently some people do. It's doesn't sound like a good thing to teach children (that it's o.k. to throw things out of car windows), and on the remote chance you get caught it could be a very large fine for littering.