Victoria 6 deformation

Shjak Monde

I was kind of hoping that Victoria 6 was going to be my answer to my problem. perhaps some of you may be able to shed some light to help me.
I wish to create a female character that resembles the Vampire Females in the Movie " Van Helsing".
I was hoping that V6's lower jaw could be lowered, stretching the facial skin along with it. However her lower jaw seems to naturally pivot at the Natural Pivot point.
Maybe there is a trick where I may change the lower jaw parenting so that I can simply use the Transform "YTrans" to adjust the lower Jaws height. any tips will help. thanks