OP I think you are getting a massively hard time here!!! Yes you probably'should' be able to cope, but surely this is what friends are for? Yes the distance is an issue but it certainly doesn't mean she can't ring you, and at least have visited once. Your update makes her sounds even worse - unfortunately I think you have overestimated her.
I broke my wrist a couple of years ago - nowhere near as bad as yours, and I had dh and two teens at home, but couldn't drive. One local friend took me out for lunch and shopping once a week, another over an hour away came twice and I had lots of invitations for coffee/walks etc and people just checking if I needed anything.
Yes I literally could have coped, but surely being a bit thoughtful and helpful is what being a good friend is a about. Sounds like your friend isn't one.
I am going through a tough long term family health situation and have lots of friends offering moral support and checking on me even though they don't know the people directly involved. I am doing the same with another friend.
I just thought that's what friends did. Having read this thread I'm now pretty sure most of my friends aren't on it because responses would have been very different!! And I am an independent, Low maintenance person, but someone going out of their way to support me means a lot.
OP I think you have learnt a lesson here, hope things look up soon and carry on leaning on those you can, you must be proper fed up.