Vaerraent
Sergeant

It'd be so cool if you could get the girl permenantly. Here's an idea - Each time you do the quest, there's an 8% chance that instead of the girl going into the city, she will say something along the lines of;-
GIRL:
"I... I don't want to go home, I'm scared of the bandits, I don't like feeling so helpless. Brave [sir/mistress], could you teach me how to fight, how to stand up for myself? My family will not mind, as long as I have one such as you to protect me."
RESPONSE:
"If that's what you want."
"No, I'm sorry but it's best that you stay with your family."
After that, no more quests to save that damned girl. Good idea?
GIRL:
"I... I don't want to go home, I'm scared of the bandits, I don't like feeling so helpless. Brave [sir/mistress], could you teach me how to fight, how to stand up for myself? My family will not mind, as long as I have one such as you to protect me."
RESPONSE:
"If that's what you want."
"No, I'm sorry but it's best that you stay with your family."
After that, no more quests to save that damned girl. Good idea?