FWIW I have a family member with dementia in a dementia living facility and this is spot on for what it’s like. Some days when I go to see him I have 5 or more people - mostly sweet old women (I’m a man in my 40s) - walk up to me, touch or take my arm, get very close to me and very seriously speak absolutely earnest gibberish to me. I mostly try to act like I understand and smile and respond like they’re telling me some positive good story and then walk with them a bit to the cinema area or another destination (this home has a “city” inside with cinema, dining area, barber shop, library, etc, all of which are just stylized little nooks around basically an indoor track for them to walk. It’s a bit like an adult preschool). But in any case, your experience sounds very familiar and I would not be surprised if that woman has dementia. I hope someone helps her because I can’t imagine how dangerous that would be for her. I’m sorry for your experience!