My child is 7years old and is constantly confessing for having bad thoughts. the anxiety is causing her to get distracted in class. what can i do?

Get her evaluated: Contact your doc & see if s/he knows someone that can evaluate her. you & she both need help dealing with the stress produced by these events. a child psychologist or behavioral therapist can help assess the issues & teach you both skills needed to get past this.

Good eval: good child psychiatry eval indicated, get her into counseling(cbt) can be very helpful. Consider removing additives hormone disruptors from diet and environment, and anti-inflammatory diet(avoid sugar, dairy and grains). Best Wishes! I would not rule out medication , but would not begin there.