[ArtDodger]

Why a zonkey and not a debra?

[RckyRaCoCo]

Stripe-ists

[Jonty30]

Here is your answer.

Zonkey Classification and Evolution
The Zonkey is a hybrid animal that is created by cross-breeding two different species of animal that belong to the same genetic group. Technically though, an individual is only classed as a Zonkey if it is sired from a male Zebra and female Donkey, as one that has a male Donkey and female Zebra parents is known as a Zedonk.

https://a-z-animals.com/animals/zonkey/

[A Formerly Proud Canadian]

Perhaps if the colt were a she, then she might be a debra. But then, if the colt thought itself a female, then yes, 'she' should be a debra.