Thanks everyone! I did talk to the breeder. She said as long as she is eating, peeing, pooing normally, has a firm tummy, acting like a energetic puppy, that she is just going to stay small. They also told me she has a father and grandfather that were very small, also! They have had some that stayed in the 2 1/2 lb range as an adult. So, I guess we will have to wait and see how she does!