In Chapter Five, how does Bri's mother handle the situation when she is called to pick Bri up at school after the incident with Long and Tate?

In Chapter Five, Bri's mother stands up for Bri and confronts the principle when she is called to pick Bri up at school after the incident with Long and Tate But later, she tells Bri that in situations like the one she just encountered, it is important for her to follow instructions so she does not get hurt.