C.D.
I took my son's pacifier away when he was 2 yrs old. I was worried because he was really attached to it and he didn't have any other comfort object. So this is what I did and it worked like a charm. I pooked a hole in the end of them and about every other day I made the hole bigger. Eventually, he couldn't get any suction so he held them instead. After a short while he gave them up because they were "broken". I she grabs her brother's I would say you are a big girl now and pacifiers are for babies. You can even try that and have her "give" hers' to him. I hope that helps.
C.