What is the best way to handle delusions for a parent with dementia?

Our mother with moderate to severe dementia has been experiencing delusions in recent months. They worsen with illnesses (UTI, Bronchitis, falls) but still persist after she takes her antibiotics and regains her health. My brother tends to correct her every time she says something that is not true (“Someone came to visit, I went to China yesterday, I assisted the doctor all day with medical procedures, We had a baby…etc.). I tend to let her live in her delusion as long as it is not harmful. Question: Is correcting her more helpful; Will it pull her back into reality? Or is going along with the delusion better for her mind-frame long term? Thank you for your input!