From the still frome of this photo, (not seeing if she obstructed at the begining of the slide) I would not call obstruction.. The catcher is positioned( from what I can tell in the photot with her feet on either side of the plate, giving the runner a clear path to the base, which is perfectly legal..( unless there is no play and the catchers positioning makes the runner slide to make to the base, but in this case there is clearly a play. The runner is just about to touch home plate with a slide between her legs and all looks legal.
Now was the catcher down at first and only started to get up to receive the ball, but impeeded, caused contact with the runner before she broke through on the slide, that is one way I could see this as obstruction, but just going on the photo, I say NO obstruction!!