Um no!!!!
Do not use throwing the paci away as a punishment! She will see it as that and will resent you, nor will she understand why.
There are two different ways to do this:
1. Get a Box and ask her to put alllllll of her pacis in it. Have her help you wrap it up....put it under the tree for Santa....Explain to her that Santa is going to give your pacis to new babies who need them and because you were so nice, Santa is going to leave you something special in its place!!
(Most 2 yr olds will think its a great idea...my daughter did it and was so proud to "help" new babies, she told everyone!)
2. Have a balloon party, go to a park, get a helium filled balloon and tie the paci to the string, then let her say goodbye to it and tell her that the balloon is taking your paci to the babies in heaven.
But honestly, DO NOT throw it away. it will create a HUGE war, power struggle, and tantrums. Why make her sad/upset/mad when you can show her that she's helping other babies by being a BIG GIRL and giving her pacis to children that need them??