Enduring POA was phased out several years ago.
I seriously suggest that you ask her to give you Lasting Power of Attorney, as these replaced the former. There are two types, one for financial affairs and one for health and welfare. They do not kick in until you friend becomes unable to do things for herself but can only be drawn up while she still has her mental capacity intack.
This will ensure that no one else can come in at the last moment and takeover this lady's care without consulting with you. I personally know of a case where an elderly husband, who was coping well with his wife's dementia and caring for her admirably at home, was overruled by a niece in partnership with a social worker and she was taken into a care home. She died within a month having deteriorated terribly in a short time, due to malnutrition and dehydration. He had no POA.
Plenty of good ideas above, but do see if this woman will grant you LPAs in BOTH areas so you can have a measure of influence in her affairs.
Old sayings with a theme 2 ( continuing *nanna8*'s thread)
Six foot two, eyes of blue. kg v lb. cm v ft + ins
Fashion for short, overweight woman
To think that London, or anywhere else for that matter, does not belong to any one demographic