Did JCP end up reporting?
From my experience, JCP does report AU's. Case in point: My husband added me as an AU on his JCP card. However, his ultilization was way high. Like 4,500 of a 5,000 limit. So I called the bureaus and asked to be removed. Although his payment history is excellent and his credit limit fairly high, my FICO went UP when I took myself off. I suppose it was because of the high ulitization.
Since I don't live with my mom I don't think it will show up on my credit. Her address is one of my previous addresses so I don't know if that will help or not?
It still might.
Do you know if a statement has posted yet (since you were added on)? If so, when?
Generally AU's show up soon after a statement. JCP updates to the bureaus, and then they post. Immediately for EX, anywhere from 3-7 days for EQ and TU.