Missing Therapy

so there's been a lot going on at home and i haven't been to therapy in about 2 weeks, I haven't been taking my medicine and my depression is getting worse. i need to talk to my therapist really bad, but whenever i ask my mom to schedule an appointment she says she will but never does.. we both go to the same therapy place and she sees her therapist every week, but doesn't schedule an appointment for me.. or like when i remind her about it, she gets an attitude and says "ok, i will". i don't know what to do.. i'm 15 years old. any advice please??