Controlling parent

What would you do if you had a controlling parent? Controlling meaning nosy, always wanting to know every single thing going on in your life, wanting an explanation for any choice you make even if it doesn’t effect them. I don’t want to completely cut off contact but trying to distance myself causes even more questions and an extreme reaction from her, such as “fine then we don’t have to talk at all. I’ll just stop texting and calling you”. Before anyone asks I’m 30.