I have a few practical ideas about how you and your friend could minimize the risks.
Check the house for things one can trip over: lamp flexes along the floor, rugs with fringes you can catch your toes, or the toes of your shoes in, rugs the slither around, uneven floors, things left on floors because picking them up involves bending. And get rid of all these hazards.
Is the lighting good enough?
Is your friend's eyesight good enough? When did she last have her eyes tested? Changes in my sight caused quite a feww stupid accidents before I twigged and booked an eye-test.
How is her balance?
What are the soles of her indoor shoes or slippers like? Believe it or not, slippers often have slippy soles. I discarded a pair after sliding on the stairs! No harm done, but next time?
Scalds and burns: are these caused because lifting a pot of potatoes is harder than it used to be? If so, use a smaller, lighter pot, or alterately leave the pot on or near the stove, having turned off the heat and lift the contents out using a skimmer, or simply strain vegetables into a bowl by the cooker instead of walking half-way across the kitchen to the sink.
I have never heard a correlation between accidents and fraility, but there may well be one. I have always assumed it was sight, balance, or diminishing strength in our wrists that caused a lot of these accidents.