H.K.
I haven't done this myself, but I've heard about it...
Having the child "give it away". Like maybe for Christmas she could leave it for Santa (with the plate of cookies or something) and either ask him to give it to another little baby that needs it or ask for something new in trade??? Maybe she could even start "practicing" getting used to not using it between now and then by leaving it somewhere that she can see it (on a dresser or under the tree, etc.), but try not to use it. Just a thought...