Just write down what has happened as a matter-of-fact statement. My suggestion is to format it like this:

"Dear, Ms. Social Worker,

You asked for feedback on ds' first week at school. This is what I've observed _______. This is what ds has told me _____. DS feels _____. Thank you for asking about ds. We appreciate your care and concern,

Sincerely,

Me"

After you've written it, walk away for a few hours or a day, then re-read it and make sure the tone sounds ok to you, and add more details if you have them. Then send it. I wouldn't delay too long since you've been asked for feedback by the social worker.

Good luck!

polarbear