Dinker female (unproved potential genetic trait) bred to a dinker male, champagne, and ivory could produce the following:
Normal or Dinker or semi dinker from female
Normal or Dinker or semi dinker from male
Normal or Champagne from male
Yellowbelly from male
My guess is it's some kind of dinker (note, there are a lot in there) or a yellowbelly or some kind of dinker and yellowbelly
I get a little irate at the use of the term dinker by everyone, there really needs to be a subheading for what trait/s is/are being called into question. Especially in a situation like this.
Additionally I would highly like it if breeders selling females who have been bred also gave you a log of pairings over the years, retained sperm is unlikely but possible