Earlier quoted context omitted.
If those thoughts are factual and relevant to the topic at hand, it... does seem like it's reasonable? She's an engineer, not someone working a type pool.
Only because you brought it up, someone in the typing pool likely has more education and experience: https://www.linkedin.com/in/kathryn-spiers-1b3048a1/ By any measure she's not an engineer.
Tbh it sounds like other ulterior motives are clouding your judgement here. She seems like exactly the sort of engineer who would benefit from unionization and while I might need it less, I fully support her and I'm disappointed in Google for firing her.
As I've said elsewhere, these sham reasons for firing folks adjacent to union activity are opening up the company to massive liability and imo the board and shareholders should hold more people accountable.