Is it possible that she is putting effort into something you do not see?
I am asking because what you are saying here is basically what my parents said to ME as a teenager. I got below-average grades and made the barest effort at school. I didn't have many friends. I didn't play sports or join after-school activities.
However, I was putting extraordinary effort into my own self-education. I read ALL OF THE THINGS. Stacks and stacks of books, magazines, comics. I observed, and journaled about my observations. I listened to a huge wide variety of music and learned a huge amount about music styles and music theory, even though I wasn't interested in playing an instrument. I had a very hard time relating to people my own age so I spent huge amounts of time envisioning social encounters, playing them out in my head over and over and over, just so I could cope with people in real life. From the outside it looked like daydreaming perhaps. For a time my parents were fighting a lot and that drove me deep into my own shell. Just coping with my own emotions took a huge amount of processing space and time, there wasn't much left over for that ridiculous thing called "homework".
I came out of high school as a fairly well-adjusted person with my sense of curiosity and self-esteem intact. And that's no mean feat.
It's good that you can remember how much it sucks to be a teenager. I do too, and it really helps me be sympathetic/empathetic with my own teenagers (who are 18, 15, and 12). But I also try to remember all of the things I WISHED my mother would have said to me at that age, all of the things I WISHED she had done, and I try to do and say those things, too.
Hope this helps.