My Child Won't Talk in Class? Any Suggestions?

My Kindergartener is like that, somewhat. He was shy when outside his small comfort zone. We worked on that by asking him to order at restaurants. I would purposely not speak up for him to encourage him to speak up for himself.
At first he mumbled, but learned to speak clearly and concisely when he needed something. Now, he's still hesitant but will speak up if he feels the need.

This would be called Selective Mutism which you can google and read lots about. Good luck.

My daughter, who is now 7, did the same thing! She was always VERY verbal at home, but did not talk to anyone in preschool. She loved going, and loved the works and projects, but would not talk. She did answer questions presented to her in a one on one lesson. I, too, was worried a bit, and sad that the teachers didn't see her true personality. With her, each year got a bit better. In 4 yr. old preschool she talked to the teacher when asked and even had a friend. In kindergarten she was still quite reserved, but opened up a bit more. Now that she is in 2nd grade, she talks quite a bit, and is more comfortable asking questions, and has made many friends.
We have worked with her quite a bit on this because she is "shy", and sometimes "force" her to ask for what she wants now, and all of her teachers have been very helpful - very encouraging.
I would suggest that you be patient, and talk to her teacher about it - they may have some suggestions.
Good Luck!

PLEASE check out www.selectivemutism.org website. I think it will really help you.