If the gun has an adjustable comp, move it to the left (this is for a RH shooter)
If not she needs to place her cheek more on the stock. If the gun has a mid bead, it should align with the front bead, almost making a figure 8, if she does this and it still shoots left you may have to bend the barrel.
Take two glasses, place them about two inches apart, two feet away from you, then take a pencil about a foot away from your eye, aim it at the left hand glass, without moving your hand,move your head in the direction to change your aim to align with the right hand glass, that will give you the direction your head needs to move.
Glad to see you have another trap shooter in the family.