I can't speak directly about the program you are applying to. However, it sounds as though your GPA is fine. Any work experience with people will be beneficial to your application.
As for the narrative, again, not knowing exactly what it asks makes answering your question difficult. Make sure that the writing is top notch; have several people proof read your paper. One of the most important aspects is your writing ability. If you cannot write well, even a really high GPA probably wouldn't get you in. Obiously, pay attention to word choice, grammar, spelling, and length of your paper. Keep it as concise as possible. Also, don't discuss your issues in great length.
Hope this helps. Remember that MSW programs are quite diverse and a lot depends on the other students applying. The more students apply, the more competition, the more you have to be on game. Make sure that you have answered all the questions accurately, and that you stay on focus. Also, make sure you give reason why you want to be a social worker.
David
