I replied a few weeks ago and just thought I would give you an update. I wasn't worried about keeping DD in diapers at night for a while but a week ago she decided she no longer wanted to wear a diaper at night. Knock on wood but she has been dry every night (and she has been dry for about 4 weeks straight now).
I didn't do anything special. She just stayed dry and asked for panties at night time. I'm hanging on to the diapers for now (just so I don't jinx myself!) but so far it looks like we truly are done with diapers. We've had a couple of nights where DD woke up and asked to got potty (even when she was wearing a diaper).