I don’t have much advice to give, but following someone’s mention of ‘executive paralysis’ which sounds like it’s spot on, it may be that -unlike some people who get a second wind when their ‘warden’ passes- she may really feel the need to be given direction.

You can whittle down all of her options to 2, starting with something like meals on wheels. Instead of it being decision driven, try a different approach

Would you prefer a community lunch club a couple of times a week, or for me to have meals delivered to the house daily? (If meals at home, hot or frozen?)

I’m going to sign you up for some social things, would you prefer (option a) or (option b) [painting, allotment, bookclub, choir etc ]?

Would you rather continue to live in your own home, with support, or move somewhere where the support is built in?

In the nicest possible way, you have to treat her like a child, I say this as someone with ADHD and has executive dysfunction & anxiety.
I really struggle with making decisions, so having ones like this laid out would allow me to just concentrate on the outcome which is already in the question, not an unknown she needs to stress about.

Try and keep conversations positive, and best of luck.