Looking at ways others play this scenario. Runner at 2nd less than 2 outs. Batter hits hard line drive to center field. On this play,as runner rounds 3rd and runner rounds 1st, who would be the cutoff if the throw is attempted to be thrown home to.
Pitcher should rotate behind the catcher at the backstop to backup throw and 1B should move towards the pitching circle lining themselves up between the throw and home plate. Catcher tells 1B to move left or right to help line them up. 1B holds up arms to form a "Y" and outfielder should throw the ball through the Y, allowing the catcher to make the call to let the ball go through or to "Cut-2" trying to get the batter at 2B if she attempts to take 2nd on the throw. It is important that the CF not "airmail" the throw where the 1B has no chance to cut the throw and make a play at 2B. A good 1B coach will send the batter to 2B if the throw is too high for a cutoff every time.