That would be hard for me to make a call without visually seeing the play, but nevertheless any umpire's decision which involves judgement such whether a hit is fair or foul, whether a pitch is a strike or ball, a runner is safe or out, or whether a ball is caught or not. In establishing the validity of the catch, the fielder must prove she has control of the ball, in what I read the ball was prevented from hitting the ground by a player's equipment. I would probibly have called it a No Catch! But the Umpire in his/her judgement must have felt the fielder showed control prior to the glove being dislodged which resulted in an Out.
FASTPITCH! Anything else, And you're playing too SLOW!