Obstruction at the plate?

[MDblue]

OK -- this happened the other night.

Extra innings, visitors have runners on 2nd & 3rd with 1 out. Batter hits a slow grounder back to the pitcher. The runner is halfway to home plate and the pitcher flips the ball to the catcher, who catches the ball and goes to block the plate. As contact is made, the ball becomes loose, bounces once and the catcher regains control of the ball. She then tags the runner who still has yet to reach the plate because the catcher was on top of her reaching over her to get the ball. Mind you that the catcher hardly took any time to regain control (a matter of a second or two). Obstruction or an out?