I would throw all the dummies in the bin. Once they have been taken away, that has to be it... otherwise you will have a child that will scream for as long as 2 weeks to get it back!!!
Maybe you could try giving her calpol if she won't settle at night, in case it is her teeth.
The most important thing is that you do not give in, even though it is hard, otherwise she'll think she has got her way.
My Ds was the other way round, he would never sleep at nursery in case he would be missing something, I think. But was easy to get to sleep in the car still if needed at this age, and up to the age of just 3 I think, when No. 2 came along.
I got rid of his dummies at 2.4 years, and I was very lucky, he only asked for them twice. We made a big deal about putting them in the bin so he knew they had gone, and whenever he had found another one ( I must have had about 25 of them!!! ) he put it in the bin himself with just a little persuasion. Maybe your DD needs a little closure, so you could have a little 'dummy going away do', or post it somewhere, etc.
My son does still have his 'towels' (dyed terry nappies) though, for comfort, but I see these as harmless, so I'm in no hurry to get rid!