just because someone is old doesn't make them a lovely little sweet old lady - they are the same as anyone else, they have just been around longer.
They also don't suddenly become weaklings either.
people seem to automatically trust old people and assume they are just kindly old duffers.
just remember - ian huntley, rose west, that old hag with the psycho dog etc etc - will all be old one day - will they suddenly become all lovely and kind and trustworthy?
anyone can feign ''confusion'' and dementia
just remember all those asbo shows and neighbours from hell shows - they invariably feature and horrid old person.
you did the right thing, by keeping her out, but also getting some help for her.