We have friends who were staying with their mom but when she very uncharacteristically got violent and started threatening to kill people, they HAD to put her in a secure place.
My m-i-l had no quite got to the point where she needed 24 hour supervision but was close.
Our biggest fear was her cigarette smoking. And there was a lot of controversy about whether someone should even be buying them for her.
Understood. I felt awe for my mom that in spite of the dementia, she was careful with dangerous things and even stopped driving without us taking the car away. Driving is one of the moments where things erupt because elders love their independence!