Conversation so far:
whaat is supergirl's bronze age?
After long-time Superman family editor Mort Weisinger retired in 1971.
what happened during the bronze age?
the character underwent revitalization under editor Joe Orlando and artist Mike Sekowsky.
anything intresting happen?
leaving her adopted foster home with the Danvers family, Linda goes on to San Francisco where she works for KSF-TV as a camera operator.
what else happened?
These stories introduced Supergirl's most memorable villain from this period: Lex Luthor's niece Nasthalthia, or Nasty.

Question: why  her SG and nasty feud?
Self-contained rewrite: why did supergirl and nasty feud