(1) Motion detection lights above every doorway in the house. (2) Anti-slip pads beneath every carpet. (3) Guardrails and grip points in places where you normally wouldn't consider it (e.g. garden).
I knew the people who made GrandCare. Its some non-invasive monitors in the house -- basically the point is if your mom fell down and can't get up -- it should detect it and alert you. I've not used it, but they've been in business for a while now so I assume its alright.