ADHHA clearly has an 11 year old mare with the same sire and dam and color and markings in its database, and it clearly was registered with them as a foal… there are multiple other offspring from Mailnda (Reba’s dam) who are registered with ADHHA.
The sire, Ulandro, is KWPN registered and approved. But he was widely used by ADHHA breeders on a variety of mares with a variety of pedigrees. I think there are over 200 of his offspring in the ADHHA studbook.
I do not know if the mare is actually registered with KWPN as well, or if she was inspected and approved for their studbook. It does seem clear that Kate changed her name.
I definitely think it is fair to say that Kate is omitting key information about this mare when she describes her as “KWPN” …
*ETA: There are 245 offspring for Ulandro listed in the ADHHA database. So he clearly was heavily used by ADHHA breeders.