Power Lines — Anne McCaffrey; Elizabeth Ann Scarborough

Yanaba Maddock's short-lived career as a company spy had ended the moment the planet Petaybee and its people had adopted her as one of their own. Now she was dedicated to keeping intergal from exploiting and wounding--or even killing--the world she had come to love. For Intergal persisted in denying that Petaybee was sentient, and nothing would stop it from stripping the ore-rich planet--sentient or not.

Only solid evidence would convince the company to leave the planet alone, and for all its sentience, Petaybee's communications were highly subjective; indeed, some outsiders seemed entirely immune to its voice. So Yana and her friends would have to find some other way to prove that the planet was worth more to the company alive than dead...