I have a son (14) but I was a teenage daughter once upon a time and remember well. I battled with my mom constantly. It does get better. Maybe one thing you can try to remember during those tough times is that whatever you're going through (school issues, social issues), she's been through it also. This helped me sometimes to remember she's not perfect, is human, didn't/doesn't always have all the answers and through all the noise (nagging) is really just saying she loves me, worries about me, and just wants the best for me (better than what she had). HTH
3b&c mix, CO (most of the time)