Yes, you can check out these two organizations which have local groups:
https://www.girlsontherun.org/
and I also recommend this summer program in MA: https://sbschool.org/summer/debate/
My sixth grade daughter really enjoyed the middle school version of Girls on the Run, called Heart & Sole. She was the only new girl at first so it wasn't easy to begin with, but the coaches did a good job helping the girls connect. Thing is, it centers around running and culminates for the fall with a 5k this Saturday. I believe they start up again in the spring, but I'm not 100% sure. I don't think they meet in winter.
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Really hating my daughter's self doubt and second guessing and my encouragement doesn't seem to be resonating, so I'm looking for external help. Has anyone had any success with a group setting where girls can talk about their feelings among their peers and learn how great they are?