Why was Leah's other sister, Nicole, not on her TLC S2 show?

I noticed all of Leah's immediate family and her sister Shannon and her Hisband that left Scientology. However, I noticed her sister Nicole was not on the show more ever mentioned, even during the family therapy session which they all discussed their feelings, guilt, etc from Leaving and being apart of Scientology plus losing friends and family members now that they are all SP's to anyone in COS. I was wondering if Nicole left the church before Leah and the rest of her family and was an SP before Leah decided to leave or if Nicole is still involved and cut herself from her entire family? I remember years ago, Leah's Lifetime Special which featured her then BFF's Kirstey Alley and Jenna Elfman (who gushed how amazing Leah is and so pretty and wishes she'd let people see her without all of that makeup (it's like a symbolic mask back then now they I reflect) as well as her sister Nicole. I remember Leah saying when they lived in Brooklyn, if anyone started to pick a fight with her as a kid, Nicole would step in to protect her or intimidate those kids. So I wonder what happened to her? I always knew she had two sisters but always saw Nicole, not Shanon be with Leah.