I, too, have had the pleasure of meeting Gretchen through work & chatting with her. Without exception, I've always parted knowing more than I did before, & never left in any doubt that she believes in all the people she works with, whatever their specific role. The NATS I see has a far better understanding of what being safe really means. It's disappointing that certain people still feel the need to talk about apportioning blame - I've never heard her talk in those terms. And what is this weird ATCO hang up with dismantling peoples life history, looking for perceived holes? She has easily 10+ years involved civil UK ATC - or does working for NATS not count?
Most people reache a point where they feel the urge to move onwards - & she's leaving a legacy that her colleagues can be proud of. I wish her the best of luck in her new role.