Just to add to what John said, recessive traits don't generally show any visual cues. Sounds like you have a beautiful animal. Its POSSIBLE that she's a yellowbelly, but thats generally not overlooked when selling a morph. Pics would certainly help. Many codom morphs do include a "clear" belly (pure white with no black speckling). Thats why you'll hear (see) people asking for belly shots. When you post pics of your girl, be sure to post good belly shots.

Oh, by the way, you did a pretty good job of describing one of my het pied girls!

Steve