I think you need to look at this problem from your angle, rather than hers.
Sorry, that's clumsily put, what I meant is that you are, quite rightly, tired of helping a friend who makes no effort to help herself. So stop helping, as you have decided to, and stick to it.
I had to do this with a neighbour and felt bad about it, but I had noticed too things that really annoyed me-
The first was that like your friend, mine made no effort to deal with things herself, it was obviously easier to get me to deal with them.
Secondly, she never asked me what she could do in return, not even after my husband was diagnosed with an agressive form of cancer - and I honestly could have used help during the last three months of his life. After he died, she told me how sorry she was, but literally has not spoken to me since. Absolutely no offers of help were forthcoming, not so much as an equiry as to how I was getting on.
For your own sake, stick to your decision not to solve this woman's problems for her. If she asks why you have changed, tell her pleasantly but truthfully that you find it too exasperating to try to help someone who makes no effort herself.
At our time of life no-one is likely to change and suddenly become practical and efficient if they have been lacksidasically all their life and things might well get worse as she gets older.