Divergent Short Summary

So far there has been a lot of sudden change in my book Divergent. My main character Beatrice and her brother Caleb have to decide whether or not to stay in their faction (Abnegation) or leave for a new faction and a new life. The descion is tearing Beatrice to pieces she doesn't know what to do or what she wants...Does she want to leave everything she knows including her family behind? Or does she want to possibly make the feeling of not fitting in disappear and have a new possibly exciting life? As the day of the choosing ceremony arrives she is nervous and can't think her brother on the other hand is calm and collected. When the time comes for her brother to decide he shocks everyone including her. But what will she do? She walks up still pondering her descion in her head its between to factions the Dauntless and the Abnegation as she stands between the two thinking what will she choose?