She was in a mental hospital 2 weeks ago due to a psychosis. 
When she went back home I was obviously à little bit scared but she seemed fine but little by little i noticed that some things weren't right. She wouldn't talk to us, she kept trying to justify to us that she wasn't mentally ill and that her behavior was due to a fall. Now she thinks that her medications are dangerous for her and that she must take them in smaller dose. 

She genuinely believes that my dad put her in the hospital and lied about everything and that she's totally fine, idk what to do it creates so much tension, she thinks that we've been manipulated, that I'm calling her crazy and that we're all somehow taking our revenge on her.

I've never had a good relationship with my mom, she wasn't there much during our childhood and when we have an argument she would often call me ungrateful etc...( admitedly I'm not the perfect son either and I've never shown her much affection) but I'm still worried about her (and well about me andr my brothers too since it makes life at home difficult). What advice would you have ?