I dealt with a very similar situation with my mother for years.
When I was fourteen I realized she was not a very nice or stable person. For thirteen years I tried, in conjunction with my father, to work with her; get her to see that her actions were hurtful. It took an amazing amount of time and energy to deal with her.
Despite our best efforts, her behavior actually worsened over the years. Finally, after my dad died last year, she drew the line in the sand stating that she has no intention of changing. Take it of leave it. So I left it.
Now in my mom’s case there was pathological lies, deceipt, verbal abuse, manipulation, and violence.
Unless your mum’s behavior rises to or beyond that, I would agree with the advice above.
But only you can decide that.