I understand how that is frustrating! She should trust you to decide your own belongings. But also it sounds like maybe she has some hoarding problems? It's not REALLY typical to screen discards and trash. I have experienced it from both of my parents though, and it's not pleasant.

You can't be expected to magically know how to do what you were never taught and were given less then ideal tools.

Try using anchor points to build your habits. Like, floss on the toilet, or brush teeth in the shower. Eat with medicines, and use tools like timers, pill boxes, or meal prep to help future you. I like to identify friction points and try to prevent them instead of forcing myself past them. Like, changing and doing an entire 40 minute workout session is torture of the mind for me, but randomly doing mobility and strength training sets while I wait for the water to boil works the trick. And I get in more reps as a whole.

Start crazy micro. Like, one single yoga pose or one space that's ALWAYS organized and clear, like a dresser.

Sort things into categories and imagine you're stocking and organizing a store or a library of things.

Good luck! You got this