Hello! Need help with Dragon Age / PSN Profiles

Hello all!

Hope you all are doing great. I am LOVING this game a lot so far!!!

I need some help/advice. My girlfriend and I just recently bought Dragon Age: Origins for the PS3. We both have separate ps3 profiles and PSN names (One for her, one for me) on one PS3. She redeemed the Stone Prisoner code first on her profile... It works for her. Unfortunately, it will not work for my own profile. Which is a surprise because the blood armor works fine on both profiles. Does anyone know a way around this?

If not... my next question... If I sign into her PSN e-mail address on MY ps3 profile, will it affects either one of our trophies? (IE: I have a platinum on my profile... If I sign into her PSN while on my profile, will she automatically get a trophy)? Or what?

If it does not mess with the trophies or anything else, should I just sign into her PSN while on my profile? But then if I acquire trophies, it'd go to her account, not mine, right? Do trophies stick to PS3 PROFILES or PSN accounts?

Heck... Here's the best question: Is it truly worth all the trouble getting the Stone Prisoner DLC or is it just one minor character?

I truly appreciate your time and help, all!!! Let me know if my descriptions are not clear please.

Nate