Did she pick out her own underwear? When mine went diaperless, I took him to the store, and made a big deal of letting him pick out whatever he wanted. That gave him something to look forward to putting on instead of the diaper. Is she afraid she'll wet? I would just tell her accidents do happen and it's no big deal. I'm sure she'll let you know when she's ready, though, sounds like she's already there just maybe scared to take that final step.
eta: I agree with you about out of sight, out of mind, as far as diapers go. Get those suckers gone!