No, my solution to a sense of isolation is instead to find ways for women to no longer feel isolated within their field.
A great example with the other sex would be male nurses. Male nurses are definitely the minority in their field, yet they manage to not feel isolated overall. Even if they did, creating a male-nurse-only group wouldn't do a thing to correct the isolation-causing systems in their place of employment, and would only work to further separate male nurses from the majority by isolating them from the wider nursing community.
If women feel isolated, we should try to find out why and correct that instead of just sticking them with other isolated women.