My mom is insane

My mom lost her shit tonight! For no reason, she just started shouting at me like I am some kind of vermin. She had some shitty food in the fridge, for fucking weeks. I took it outside to throw it away. She fucking flipped shit. I seriously do not understand what kind of mental illness she has. She is 55 years old, never had a job. Everytime, I try to leave my house (I am 21) she starts having meltdowns. Like sometimes I don’t even leave my house for weeks, because whenever I try to leave she starts crying and begging me to stay. She is seriously insane. She gives me money whenever I need it, food and shelter, but what the fuck is that mental shit? Sometimes I think that she is possessed by something.