hmmm... where's that jealous emoticon!
i think you will just have to wait till she's a bit older & see if she extends her nighttime sleep on her own, around the 3 month mark. you can try to delay taking her out of her crib - just going in when she wakes up & let her play until it's time to eat. that may or may not do anything.
take this as gently as i mean it - be happy with what you've got!! looks like you have a baby who's sleeping great and a mommy who knows how to listen to her baby.