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Trying to throw my own thoughts into the question. First, a few questions: are your characters on some sort of quest? What is the group trying to accomplish (or are they just friends)? Is her brother in this group?

Anyway, here are some thoughts without those answers: If her brother is in the group, perhaps he brought her along (to take care of her, perhaps?)

Does she have a skill that the others are in need of and lacking? (Even if it’s as simple as being able to forage for plants or knowing how to bandage wounds, something that would aid in the band’s survival would garner her a reason to join).

Does she have a debt to someone, or does someone have a debt to her? (Maybe by some circumstance she has to come [i.e. someone saved her life and she won’t leave them alone trying to repay a life debt, she has helped someone else (financially or otherwise) and joining is the way she wishes to be repaid]).

Like @turtleshavetoes said, does she have knowledge the others are needing and lacking?

Can she force her way into the group without the group’s approval? Does she even want to?

Does someone in the group (i.e. her brother) feel responsible for her? Do they need to take care of her?

Similarly, would she die if she were left alone? Do they feel morally obligated to bring her along?

Does someone have a crush on her and is keeping her on the team?

Is someone keeping her on the team so they can keep an eye on her?

If I’m not understanding you, please give me any clarification that you can tell I’m missing. I hope something I said here sticks. 🙂