Stepdaughter Wants me to Help Her Pick Out Audition Clothes

It's nice to have my stepdaughter Britt staying with me. I've always tried being her "buddy" so when she asks me to help her pick out clothes for an audition I easily say yes. Well, she wants to dance at a local strip club and really wants my honest opinion. I can't help but wonder if I made the biggest mistake ever letting what happened happen. Did I ruin my relationship with my stepdaughter? When she slips in my bedroom I realize that I didn't ruin it, but I definitely changed it.