I have a 23 mo boy and a 3 mo old girl and my son is still using a pacifier. I never felt the need to take away my son's pacifier before our new one came - I honestly thought he'd need it when the new baby arrived. It's been very sweet to watch him try to relate to his sister, via the pacifier. Like when she's crying, my son will run and find a pacifier and offer it to his sister and then say "Baby crying." I think on some level, he gets so much comfort from his pacifier, he wants to try to comfort his sister in the same way.
Anyway, all that to say, your daughter will grow out of it... sometimes we're ready to get rid of it before they are. I always tell myself "They're not going to go to college with it." It helps me remember that my little ones have limitations and most of the things that frustrate me are just stages and seasons in their little lives.
Good Luck