Could of been the aggression. She is in with a female that is an inch or two bigger then her but there is no aggression between them. I am fairly certain the female I got from you is not pregnent, she has put on more weight in the back end but just filling out, not really getting a bulge at all. You will be one of the firs tto know when I have pups from the marbles I have hear. Should be some very nice pups! Hoping springtime as the male will go in beginning of January and staying in until I know he has the job done.