Switched to underwear at night

So last night Nat informs me she does not want to wear pull-ups at night anymore. Luckily for me I had 2 pairs of special underwear for night. They have a little bit of PUL lining. So I put her in those and she successfully stayed dry!!! YAY!! She has been dry at night for about 2 weeks --- sometimes she'll wake with a little bit of wetness - and I think that might be because she gets busy after she wakes and doesn't want to visit the potty. However I think I may have stumbled onto the right motivation. Princess tattoo's - so for every day she stays dry or night she stay's dry she get's a princess tattoo - I need to invest in more of those.