I need to know when an incident is an emergency. This nice lady tends to talk a lot when nobody around to listen. Calls people ungrateful and reflect on what you had and how provided when you were a minor. I'm 35-45! Bad mouths my elderly father. He always kept a job we always had food ; heat in winter, a/c in summer. We went on family vacations. How to deal with this? Especially When hearing problem is present & senility?
"This nice lady tends to talk a lot when nobody around to listen".
But you are listening? Do you suspect abuse? Or what exactly?
Your post doesn't make sense, really, especially when you say "I'm 35-45".........I'm 63, not 63-73.
What exactly is your question? If you have a 'nice lady' as a neighbor who's getting on your nerves, don't interact with her anymore. HER opinion of your father is none of YOUR business, so don't listen to anything she has to say.
All you can do is move Dad away from her. If this is a neighbor, then contact her family about how she is acting. If no family call adult protection services and report a vulnerable adult.
What kind of emergency could exist that is caused by what someone says about you or thinks about you?
Can you tell me how this "nice lady" is related to you? How she is related to your father?
https://www.agingcare.com/topics/8/dementia-behaviors/articles
How well do you know this lady? Does she have family nearby? I wouldn't consider this an emergency as it sounds like she has been doing the above for quite some time. Get her family involved.