I need serious help with my mother

Hey , I'm (16M) and my mother (53F) are having a trouble, she's a single mother of for kids (me and my two sisters and brother) and she's been the greatest mother a person could ever want , she been through a LOT with her past two husbands and my two older siblings (they suffer mentally) , I never saw her weak in my life untill like 10 months ago , she went through dramatic situation with her sisters which caused her (from what I believe) brain fog , I really want her to visit a therapist but she refuses thinking it won't do anything and she doesn't feel "ill" though me and my sister see it as clear as the sun , I suffer from severe brain fog too bc of some toxic people in the past+ doomscrolling and sadly masturbating, but I'm self aware and I truly believe a therapist would help , also one of her recent excuses that she's feeling useless and hopeless of my two older siblings, please if u got a tip , help me , summers almost done and I'm so overwhelmed this will last without me doing anything Abt it.