Tech company employees outside the marketing department are generally preferred to not say anything publicly at all. I've helped author a couple official engineering blog posts, but those always go through lawyers and marketing before release. Lots of companies like Google also hire very expensive consultancies to prevent unionizing as well. So she set herself up to battle a company that just needed a legal excuse to get rid of her at that point.
> At the end of my tenure, I was isolated, had my Slack messages surveilled and used against me, learned that Apple had access to my personal iMessages, and received several reports of requests to disparage me and my statements
Hopefully she learned a bit. She complained a lot about her Slack conversations being surveilled, but you should always assume your employer is screen capturing your computer, recording your microphone, keeping your web cam on without your knowledge, and possibly sending your emails and other communications to your manager for reference or even approval before passing them on to the intended recipients. I've seen all these things and been asked to help set some of them up. You've usually given up any right to them not happening on a work computer at some point during new employee onboarding if not sooner.