Honestly, the pistol is a tactical pistol, not a target pistol. As such, the trigger pull is heavy.
If your sister is going to carry the pistol she might want to leave it heavy........when the hair crawls on the back of your neck, her heart beats fast, and the adrenalin flows, that heavy trigger will feel very light.......during a stressful situation, a heavy trigger pull aids to prevent an accidental discharge.......not always a bad thing.......