Alzheimer’s is progressing so fast

My mom has alzheimer's and still lives at home. My son, his wife and 2 small kids live downstairs and care for her. Today she got agitated and and left the house. Fortunately my daughter in law drove down the street and saw her. Mom was very mad and insisted they walk up and down the road.
Anyway, this is progressing so fast that something needs to be done now. I was wondering if anyone can advise me on safety locks for the outside doors? I know it sounds so barbaric but I just want a way to keep her safe so she doesn't go out.
I'm also thinking we need someone to come in a give them a break, but where do I start? She has Group Health Ins. maybe I should call her Dr. and see.
Thank you for any advice or encouragement you can give

Thanks for the reply Steve n Dallas. I've tried those door knob covers and she figured them out. I know I'm worried about fire and people needing to get in and out. Maybe an alarm?
I called the Dr. office and they will send out a social worker. It sounds like Ins. may cover some of this (fingers crossed).

www.alzstore.com/alzheimers-dementia-wandering-s/1828.htm

There are a number of different solutions on that page. The "Confounding Door Lock" might be a good fit for your situation.

Good luck.