> How could she honestly expect to keep her job with an employer she is sueing and smearing in the media?

Well, she might think that the company would be loath to compound it's legal issue by illegally retaliating against her for the harassment claims. (And it's illegal to retaliate for such a claim made in good faith even if the complained-about conduct does not actually create liability for harassment, so Tesla could potentially be liable for retaliation even if not liable for harassment.)