What the heck does a Senior individual do to make sure they will have someone oversee their needs when the time comes?

[BlueAllTheWay]

A couple of decades ago a Will, POA, etc. was completed by this person. They were close to siblings and family, but things have
changed after their parents passed. This person is single, no children, or anyone close enough to count on. When the Will and POA
were set up, they appointed a sibling who they used to have a close relationship with to handle their needs once they become unable to due to old age or poor health, BUT now it's obvious the appointed sibling is NOT interested in handling their affairs and has become distant. This Senior t hen tried asking a niece if she would be okay being appointed and she said yes, half-heartedly. The thing is the niece and her family are not close and they only see each other during the Christmas holiday. Neither of them can be counted on. What the heck can this Senior do to ensure she her medical treatment decisions, financial obligations, etc. will be taken care of when the time comes?

I know there are Elder Law Attorneys, but my understanding is they really only handle Seniors who are financially well off. We need to find a solution so that this Senior can rewrite her will and remove her sibling as her POA and Executor. This individual has a very modest savings. The main concern is getting someone to make healthcare decisions according to her wishes and to keep up with paying her bills from her account when she is unable to. She is very concerned and would like the peace of mind to know she has something or someone in place that will take care of this. She knows her sibling could really care less at this point.