I had to kick my mother out at one point. I want to start this by saying no two situations are the same and I am so sorry for what you are going threw. It's not easy and sadly it will only get harder from here for a while but for your own mental wellbeing you need her to get that she is not the leader of the house anymore.
My situation happened 7 and a half years ago when me and my fiance were first dating. Me and my mother had an apartment and were sharing bills. She informed me that she was about to move out and go live with her bf. So in the course of two weeks my now fiance and a roommate (age 18 this will come up later) got all the bills and there lease on the apartment transphered over into our names
This worked week for about 6 months. My mothers bf had money so she quit her job. He was a good dude but he had his issues. Honestly I liked the guy and knowing my mother's track record was happy for her. Then one day I got a phone call. He went to the hospital. He's not responding. 3 hours later he was pronounced dead. Me and my fiance dropped everything and drove the hour drive to spend the night and the next day with my mother.
Well about a week later I find out one of my "aunts" I've never met had come to see her to which I was happy for her to have other people around. This aunt asks to meet me and my girl at a restaurant where she (without me even knowing my mother had told her) gave us money to get my tabs for my truck that was coming up in a couple weeks. I took this as a kindness I was wrong.
A week after this meeting i find out that my mother had a court appearance in 2 weeks and wants me there. I didnt know that this was because my mother's bf's mom was kicking her out of the house they had lived in and was in her name. She just assumed I would take her in. Telling me to kick my roommate out and let her have her old room back. I told her directly no. He's been paying rent and even if we wanted to kick him out (he was annoying and all) it would take over a month to do so. I told her I'd talk to the others and see what was a valid option.
So we all talked and my mother wound up moving in and sleeping on our couch. I know not fancy but it's what we had. The agreement was she would help pay rent. The first time I asked her for rent her response was "but I don't even have a job yet" I took pity on her (mistake) and payed her part myself.
Then the chaos started.
First with my "aunt" over hearing me watching the news (I normally put CNN on for background noise while cleaning) and flipping out because I wasn't watching Fox. Then I find money missing from my wallet. Then I come home to a gang of people at my house doing God knows what. Then I come home from work to my mother unplugging my TV to pawn it because "she needs money". arguments were a daily thing. This intensify when I came home to my mother and my not legal drinking age roommate passed out drunk with a bottle of Jack.
She hadn't looked for a job, she hadn't done anything. She had sat around causing hell and I had had enough. I told her if she didn't have rent by there first of the month she was to be out. She flipped. I got a wonderful amount of just the most beautiful text messages from her and my "aunt" calling me everything from a horrible person, To the spawn of satan, and everything in between. My aunt then explained that her and her husband were (I'm quoting here so no one jump on me for political bs) "Republicans so I should remember he owns a gun". This was when I told my mother the money wasn't a thing she just needed to leave. To which she said no. I then woke up to a lengthy message from my "aunt" saying she was gonna come to my work with a lawyer to get her money back. I told her that's not how lawyers work stop trying to scare me it's not working.
After 2 weeks of this I explained to my mother that if she wasn't out of my apartment the next day (the first of the month) the police would be called. I woke up to her stuff being gone but she never returned my key. There's another story in this involving my cat that wound up passing because of things my mother did but I really dont wish to tell that.
About a year later my mother would call me in tears over what had happened. She was in a fucked up place and took it out on those around her. She was empowered by people who never really cared about either of us and she had damaged the relationship she had with her son. Things worked out in the end and I have a great relationship now with my mother but it wouldn't be that way had I not put my foot down and stood up for myself back then