Kirks, it can be scary. The baby monitor does have a limited range and would not be very useful if you are not there. There are some that connect to the computer and stream information to you... I am just not familiar with any that are two way communication without participant participation. I do know the Alzheimer's Association has a program that monitors the location of the person with Alzheimer's through a computer using a locator. You do not get audio or video but you would know if she was not at home.
At first I had an in home care giver and then I opted to just move Mom (Alzheimer's) and Dad (Vascular Dementia) to assisted living where someone was with them at all times. OH boy did I resist. Those that were here then remember my feet dragging. But the first night they were safely tucked in AL... I slept like a baby! No, they did not want to go but for the first time in a long time I knew they were safe. Mom appreciated not being responsible for Dad and a big house. My only regret is that I didn't do it earlier but I had to try the in home first.
Each is different. Just know that you don't want to wait until it is a crisis. Even if you are not ready now, please check out in home care and/or facilities. They are not all created equally and many good facilities have waiting list. There is also a wide range of options available. You will need to find the option that is right for your Mom. In home care agencies are abundant and you need to check references from those that have used the agencies. Care facilities range from AL to locked memory units to nursing homes. Finding the right fit is important. It is better to have a good option for the next step in your back pocket before you need it