Should i get my teacher into trouble for this and how?

I'm sorry to tell you this, but I'm afraid you have made a bad impression on her by talking to your friend too often, and as long as the two of you keep sitting together and talking to one another, you will continue to get this kind of attention from her. I find it very hard to believe that you were perfect and that she keeps doing this - you yourself have given several "reasons" you were talking that wouldn't be excuses. The best thing you could do would be to sit separately from your friend in her cl. I don't think you have enough evidence against her - it will all be your word against the teacher, and you will lose - to get her into any kind of trouble.