Need a little more information here to give an opinion. If she's leaving her feet from her stance and not taking a step or two first, I can't see her throwing too many runners out this way. Yes, it will keep the ball in the infield, which helps to limit other base runners, but will most likely not make the out.
I'd rather see her take the angle and run through the ball, while throwing on the run, than leaving her feet every time. Every advantage goes to a right handed 3rd baseman in this instance, than taking a chance on letting it get to a shortstop's backhand, who is moving away from the play. I'd rather see one cross-over step and a stretch or dive to her right (3rd base line), and mostly running through the ball to her left.
Regardless, your 3rd baseman should always take anything they can get.