my mom is 83 she just told me she saw her dad and she hears voices in her house

My mom says she hears voices or people talking in her house. She told me they were having a party in her back room. She says she tells them to leave and sometimes they do but sometimes they won't leave. She is not afraid of them but she thinks its the devil. She is a christian woman so she believes telling them in the name of God to leave that they will leave. Her memory seems very good she lives alone pays her bills on time and remembers anything and everything i tell her or talk to her about. She does seem a little paranoid about the neighbors not liking her. There was a time she said she heard someone screaming in her front yard but she didn't call the police. She talked about it for months, thought the neighbors hated her for not calling the police. Everytime she saw that someone was found dead on TV she would get v'ery depressed and think that was the person that was screaming in front of her house. I can't figure out if its just old age or what. There absolutely no way she would let me tell the dr about any of this. She does have congestive heart failure and has had problems with UTI's. I'm just very sad about seeing my mom this way. I'm afraid that her seeing her dad in her room the other night might mean she is going to die soon. I lost my daughter in a car accident a few years ago. My mom is my only friend i talk to her constantly I just don't know what i will do when I lose her. I writing to get opinions on if it could be the beginning of dementia or any thoughts on that and if seeing her dad could mean she may die soon. I read that it does mean she may die soon. This is my first time doing anything on the internet so i appreciate anyone who reads this and any opinions. Thanks