Congrats!
Oh she is a cutie pie for SURE!!!
I don't know anything about Newfies besides they have webbed toes like you've stated.
You said the others from the litter look lab.. labs have webbed toes also. So they could be Newfie/Lab and she just looks more like a Newphie and the others could have more Lab in them. Is she a lot bigger than her litter mates?