Mums don't mean to nag or ask about your homework (again), any more than teenage girls don't mean to forget to do their Math homework or use 'that' tone. Both parties are trying to navigate unfamiliar territory. Being a teenage girl is difficult - there are raging hormones, a quickly developing body with a slower developing brain, high school and homework, best friends and boy friends and parents to deal with. Being a mother of a teenage girl is not always easy either. They struggle knowing when to hold tight and when to let go, which battles to fight, when to bit their tongue and say nothing, and then how not to give 'that' look while they're busy saying nothing.
This Mothers Day, what your Mum probably wants more than anything is to spend some time with you. Give her a chance - even if you think she's pretty messed up, she's probably trying her best.