It could be that your DD is getting movement, but not because of 9-3 rotation.
sluggers, With all due respect, I don't believe the pitch has to be a perfect 9-3 rotation to be a screwball. I'd say most, if not all, riseball pitchers have some tilt to the axis. I think the same can be said of a screwball and a curveball.
What I think is happening with man10's DD is that she's likely throwing a scrop or scrise (i.e., some screwball spin, but not pure screwball).