Financial support for elderly neighbour

Citizens Advice Bureau will give help in telling her how to cope, as well as Age Concern.
A passing comment, assuming she lives alone, has she told her local Council Tax office, as she is entitled to a 25% discount if so.
Power of Attorney in my case cost a lot of money, but not suitable for some vulnerable people.
I believe she only has to pay tax on savings interest if it is more than £1,000 per annum. If she has savings at that level then an Independent Financial Adviser from her bank might be a good idea.
Thank you for being a good neighbour.

Certainly source as much help as you can for her from bodies such as Age Concern, but whatever you do, do not get involved in her personal affairs, or agree to manage her finances. Sure as eggs, some previously unknown relative will pop out of the woodwork after the funeral. Be her friend by all means, just ensure you don't find yourself in the position of being accused of exerting any influence in regards to her money.

Not personal experience but one that an acquaintance found themselves facing a few years ago - it came close to ending very badly.

Age UK are very good, and also provide befriending for isolated folks and other services - "Call our free, confidential advice line on 0800 678 1602. We're open 8am-7pm, 365 days a year"