Is it common for my mom to have repeated, similar hallucinations?

In the past year my mother--who is struggling with dementia--claims to have had 5+ different groups of intruders. One was a man who stole her thermostat, another was a man who claimed to be fixing her phone, three women were resting on her couch when she arrived home one afternoon, and most recently two men were going through her paperwork. She says she never confronts the people, but just goes into a different room to give them time to leave--which they always do. She is able to recant the stories of her intruders repeatedly without changing details. Is this 'normal' for a person suffering with dementia?