Just thinking, maybe she said 'that's fine', as in 'that's okay, whatever works for him'? If she feels like she could have handled the situation better, she probably doesn't feel she's in a position to push for him to return straight away if he's upset. And if she knows she was unwise, she might just be feeling like a day of space and then a fresh start next week might work - I'm not saying it's ideal if the teacher needs space - but she's not the expert with all the right tricks you have up your sleeve, you're the pro when it comes to W. She's only had him for school hours for the year, and I guess she feels out of her depth in some circumstances, not having the skills you do from raising him.

All the best with the meeting. Would it help to jot down your points so you can stay focussed for the meeting? That's what I do if I know I'm discussing tricky issues so I don't ramble and rant.