Welcome to the forums. Are you sure you have a pure bred Rottweiler puppy and not a mix of one? A female Rottweiler puppy at 10 weeks should at the minimum be weighing 20 lbs. Your pup even being a runt is way undersized!!! I would be worried that there are some medical problems with her. Has she been to the vet for a checkup and wormed and vaccinated??