I have a 13 year old and a four year so I've been there and will be there again.
What I would say first of all is that having to turn her card once a week is not bad for a first grader. It's hard to have a lot of self control at that age. I think that if you are not being called by the teacher because she has not gotten to the red star or whatever then I would probably discuss it with her and talk about how she could remind herself before she starts talking but I wouldn't make too big of a deal out of it. She's only what 6? Remember when we were in school and we had that long recess and it just seems that kids have to grow up too quick nowadays and they don't have that much time to just be kids. She's more social and that is not a bad thing and in life later on it may be one of her very best assets. Yes, she needs to learn when to listen and not talk but she will. My oldest was always a talker and my youngest is more on the shy side. I love how Anthony (13yr old) can go into a group of people and seem to make friends right away. I was always on the shy side and had a lot to be nervous about growing up and I just love how he can be so outgoing. I know the teachers don't always like it so much.... but he controls it now and doesn't have any trouble at all in school. I'm sure your little girl will too.