My mom did something similar to my brother when we were in our early twenties. My brother went full no-contact for a little over a year.

25 years later, I still have to reset some boundaries from time to time.

To this day I am very careful what information I give her about my work, life, health, etc. She is super nosy and just can't stand not being all up in everyone's business trying to run their lives "for their own good".