I want to second that it is wonderful that she has knows how to make and keep friends although it sounds like she wants friends who really "get her". Our DD10 feels like an outcast in 6th grade, and it is certainly hard to see her suffer.
RBD - I talk with my DD about how we only see the "outside" of others, and we can only imagine what might be going on below the surface. Individuals show their "best" selves. Unfortunately DD will have none of that and refuses to believe that the popular girls are anything less than "perfect".
Anyway, yes, this is such a difficult age!!!!