Bendall was there while her partner damaged property, threatened her former partner with a knife, made him kneel of the floor and bark like a dog, and then forced him to sign away his car.
The car was later burned after unsuccessful attempts to sell it.
Bendall saw the victim in the street several weeks later and asked him to drop his police complaint. She abused him when he declined.
Bendall's new partner pleaded guilty and was sentenced to three years and three months' jail.
She appealed to the Court of Appeal on the basis that her culpability was lower than her partner's because she did not "participate in or anticipate the level of violence that was to flow from (him)".
However, the Court of Appeal rejected the claim her sentence was manifestly unjust and dismissed her appeal.