It'll make all your future deals a lot easier and create some uniformity for you "brand".  

This is a general response, naming attributes, based on your post and what I would want personally:-Monitored, police response -motion sensors in appropriate areas-cameras both indoor (public areas)  & outdoors - motion activated, records to cloud, holds for minimum 48 hours, w/ audio capability-remote light switch control-remote alarm mode settings : on, off, at home-remote lock / unlock entrance-remote doorbell camera (service, delivery interaction)-temperature & flood sensors around appropiate areas-alert capability (various) set for your concerns-ample exterior motion dection led lighting, some solar powered lights that illuminate all night-phone app that you are comfortable usingThere are more attributes I would want but I'll stop here. 

For the top of stairways, you can get battery operated, motion sensing lights that will come on in the dark - warning guests that they are getting close to a stairway. 

Also, you can get a wireless motion sensor security cam/monitor with phone app. and that you can actually talk into it.  

That is to me the most important step, always in motion, never stagnant.

Light can also be a great disinfectant - a pole-mounted halogen and motion-activated exterior lights might be helpful.

There are plenty of statutes in states like Virginia such as Consumer Protection and Uniform Trade (fraud) statutes that would label such a structure as a clear and obvious attempt to avoid liability.

It was a live-in slow-motion rehab, so we have made a lot of improvements in the two years we held.  

In the living room, I mounted my 50" tv on a very nice full motion wall mount.

Time to give yourself a break, acknowledge that the lady is older and needs help (like our mom or grandma would), and now is time to be tactful, understanding, ethical and put things in motion to get yourself out of this one.