Denise's thoughts: It sounds to me like she could use a boost to her confidence level, that is normal for 13 to 14-year-old with all of the changes that happen at that age. You can help her by finding things she is doing right and praising her for her efforts. As far as trusting her, she needs your trust in order to grow her self-confidence. Give her more chances to open up, talk to her about things that aren't 'hot topics' for the two of you and be patient with her.
Asking our community of parents of teens: Do you have advice for this mom? Please share your thoughts, advice and experiences in the comments area.