Excellent letter, both in tone and content. Balls now back in her court. Be sure you are maintaining copies of your back and forth contact. It may come in handy some day.
Hang in there!
BTW, I found it interesting in her response about how "sweet" your S was to her, as if that is all that mattered. That just seemed very selfish and foolish. Does she not think for a second that your S might be manipulating things/her? And on top of that, your S should have been at the meeting and he wasn't and he couldn't be found. So, it doesn't sound like someone who is doing so well.
Me51 W53 S17 S14 M22 T25 Bomb-9/11; A-11/11; I move out 11/11
It's easy to find our bottom, it is our top that requires cultivation.
Every rough spot adds to our emotional constitution. -Barney Fife