If any of the bandits get injured and/or come across Brecken, she'll ally with them. She left because of the Nobles and such and she'll be happy to help the growing resistance. She lives about halfway between the camp and the nearest kingdom.

Just saying cause I don't think Brecken would wander THAT far from her home and surely wouldn't enter a strange-looking ravine.

Because this is a (in comparison to most of the characters) small and physically weak person. So yeah, marching in where there could possibly be armed bandits is an amazing idea.