I'm a childless, widowed orphan with no family (sibling x1, nieces, nephews) in the immediate vicinity.
Nearest family member over 1 hour away and he's about to relocate a further 6 hours away (nothing to do with me!).
I'm independent and resourceful by nature.
Being only too aware of my situation, I think about worst case scenario situations and try to have a plan in mind, accordingly.
Hospital - depending on circumstances, I'd walk or get a taxi.
Shops - I make sure I have a good stock of foodstuffs with a long shelf life or freezable. I batch cook and have a good stock of pre-cooked meals that I can access easily if needed.
Locked out - I keep a spare set of house keys in the car.
Friends, who live very nearby, have a spare set also (and I hold a spare set for them).
Car breakdown - I have full cover, included onward journey and breakdown at home, so, I'd call them.
I did ask my very good key friend, if she would mind if I gave her number to GP/Hospital as an emergency contact person.
She has phone numbers for nieces/nephews so she can contact them in a dire emergency/potentially long term need situation (2 relatives hold power of attorney for health and finance for me).
She was very happy to give her permission but she knows I will never, ever take the P and take advantage of her goodwill.
I am OK with my own company and have many interests to keep me occupied so am not phoning people constantly and making a bloody nuisance of myself.
I think @Firefly45 ,that you are doing your friend no favours really by picking up the pieces each time she calls.
She needs to be encouraged to develop some resilience and independent life planning.
Maybe a conversation about these sorts of things when there is no immediate drama unfolding?