Make some "dates" with your daughter for the two of you to do something special together. Perhaps the two of you or your entire family could spend some time volunteering. Encourage her to develop her talents or interests through clubs or community education. In other words, help her focus not on getting friends, but on being comfortable with herself. In doing all this she will make friends because she is an interesting and interested person.
Spend some time talking with her about what it was like for you to make friends: what you did, any problems you had with friends, and how you worked it out. Most of the time, young adolescents need to know that parents had to learn these skills, too, and that it is possible to make new friends.