Lateral hostility is a huge problem for women in tech and it's absolutely taboo to talk publically about. Female patterns of intrasexual aggression are entirely different from male. There is a refusal to acknowledge this and deal with the problem.
It's sad to know that the only likely thing to happen from this is that Tina will be hiring more people, since people are leaving her team. New employees will be put under her, and the cycle starts anew.<p>Lesson to people hiring on: If you're hiring onto a team, it's likely the team they're having a hard problem retaining people for. If that's management or technical problems, be careful.