If your teen becomes secretive and doesn't want to chat even about how her way went in school, should you consider it normal? Why or why not?

I think it is normal behaviour since children at that stage is trying to find their identity. They would want to have their own space and exercise their autonomy. What I would propose is to respect her privacy and preferences. At the same time, still enforce some rules (such as, having to inform parents about her whereabouts; having to keep parents updated if she were to return home later than expected). Try to engage her in conversations and find out which friend(s) she is closer to. Let her know that you will be around if she ever needed any advice. Adolescence is a tough stage to manage as it is difficult to balance how much "control" a parent can exercise. All the best! Just continue to engage and communicate with her whenever there's an opportunity.