One step at a time, OP - but instead of sorting out gardeners/new cleaner/housekeeper/delivered food, you could actually give her the brochures and get her to make the calls. I feel some sympathy for this woman as clearly you do - going from a cushioned life with a DH who does everything to being a widow with an elderly mother in the house and few friends.
I would suggest agencies for everything - she sounds the sort of person who could be taken advantage of - at least with an agency everyone is or should be CRB checked. I'd also be concerned about her mother - clearly some help twice a week but will she get anything to eat once the NDN stops providing?
Do you still have all your own teeth?