If she is a year old, I would say she is about the size she is going to be. She may gain a pound or so -- Katie did and is a little larger than Izzy, weighing in at 18 lbs (which is about what she was at 1 yr).  Katie is also Type A and long and lean.  Of course, as they age, I suppose they may tend to put weight on (I mean as older pups) but I can't see KS doing that for a long time.