It sounds like she is trying to use the soft slap technique which focuses on direction control. If so, the player has to open her shoulders slightly to the right of the P before her cross step while allowing her front elbow and hands to move forward with the shoulder opening move. To her, her front elbow will look like it is slightly in front of her front shoulder. Once set, the front shoulder does not open much further during the actual stroke but the front arm does continue to move the knob forward and the back arm does a push/punch while partially releasing the wrist but not so much that the hands roll over or the barrel passes the knob. The player needs to try to keep the bat level. In summary, get her hands forward compared to a full swing handset.
Something like this.
View attachment 6468
Please explain the 'bolded' portion above. What is the batter trying to keep the bat level to, and at what point in the motion?