I found that my good friend often reported in front of the teacher, and others hated her. What should I do?

You can talk to her about her love of reporting in a euphemistic tone. Don't accuse her of bad behavior from the beginning. For example, it is good to report the bad situation to the teacher and let the teacher stop the occurrence or development of the bad situation at the first time, but it will offend some people. First of all, we should advocate unity, and disunited groups are not good groups. You should look at them from a long-term perspective. You can let people who are about to make mistakes or are making mistakes communicate first. If you can solve them yourself, if you can't, it's not too late to tell the teacher. If you hate it, you hate it. Anyway, you're thinking about them, right?