Ochigava asserted her superiority over the Kiwi from the opening bell to take a 4-1 lead.
She continued her assault with a string of venomous combinations to double her advantage by the midway interval.
Pritchard was completely overwhelmed by the Russian, who was exploding into attacks and controlling the fight.
Ochigava forced a standing count in the third round after finding the target with a rapid two-punch burst.
The Russian wrapped up a comprehensive 22-4 victory in the final round.