W.C.
I had to chuckle a bit when I read your posting. I don't know if you have ever whatched the TV show "Yes, Dear". They had a show don e on this exact sinario. The mother of the boy that had the attention and praise showered on, finally spoke up to the teacher. She felt guilt for her child getting all of the attention. The teacher then explained that he received more attention because he needed the attention and was having difficulty making friends. A good chance is that you son is more independent and plays better with the other children.
I would ask for a meeting with her after hours or sometime when she can really talk with you. (not at pickup or drop off, those are crazy times.) Just voice your concerns. Good luck.