Mom describing eerie sense of loneliness

One reason my mom decided on her own that she was ready to move to AL was that when she was living at home alone, she was feeling extreme loneliness in the evenings. She described it as something very eerie—just a weird sense of being all by herself in silence. She would sometimes describe feeling like her deceased mother or my deceased father was in the house somewhere with her.

Now that she has been in AL for over a month, she says she is starting to feel that same eerie loneliness in her room in the evenings. I'm just curious if this is something others have experienced. Is this a common symptom of dementia, or is this just legit loneliness??