Yes, it means exactly that!
The white duck is definitely not a call duck, call ducks have shorter heads and bills. She is not a Pekin, because of her size and Pekins have orange bills, legs and feet. Leaves a White Layer
or a white duck of any other medium-size breed. I have heart of white "Silver" Appleyards. Very unlikely it could be an
Aylesbury Duck, they are a rare old english breed and i haven't found them here in the U.S.
And yes, i have four White Layers, but at an age of just one month they're still yellow.