I'm not a vet, but I would say I would be concerned if there was redness, heat, drainage, puss, or if the dog was having abnormal behavior or pain. In the photo, from what I can tell, it's a raised area without redness, drainage, or puss. It could be something as simple as the internal sutures causing a local reaction. If it concerns you greatly, take her back to the vet physically to have your vet put your mind at ease or to take care of the situation.
Geist- White German Shepherd- 1/2014
Indy- Black German Shepherd- 9/2014