People are different. That's natural.
Are you asking for advice on how to force her to become part of
the main social group? How to brainwash her to reject her other
friends outside of this group? How to make her give up her
individual principles and thoughts and adopt those of this
group?
If her mind set doesn't mesh with the groups, she will not get
along and will be left out. That doesn't mean that the answer is to
force her to comply.
Spend what time you can with her. It will keep your own mind
open to be able to keep seeing the world from 2 points of view, and
that is better then seeing it from just the one point of view. And
your companionship will earn you a friend in her, probably a better
friendship then you can hope to have with anyone in the main
social group.
