I would ask you what you get that is positive from your relationship with your Mum?
Many decades ago (very much a changed situation now) but we learned that no matter what we said to my PIL they made comments and judgements on it. So we just stopped telling them stuff, were vague about things and generally left out 90% of our life in phone calls to them. I found this helped a lot. They just treated us like children. We had both graduated university, had good jobs and a nice house. It wasn't like we were living at home and unemployed.
So stop telling her stuff, stop answering her calls, respond to text messages later than you normally would and start distancing yourself a bit. I describe people like your Mum as a black hole, they suck out all the light, surround yourself with radiators, people who are positive.
Black hole personality description -
"It’s their way, to steal and destroy our goodness with unrelenting insistence. What they’ve chosen, and persist in choosing. Their grabbing and grabbing, a joy-desperation for the ego-dominance-feeders. That relentless taking their purpose. It’s how they’ve set themselves to be, according to their fear-necessity. Thing is, becoming a black-hole, and being with one, is a one-way endeavour. We have to choose if we’re going to be fodder or not"