Mom does not believe she is in her own house. Anyone know about Capgras syndrome and how to deal with it?

Mom woke at 4 AM believing she was in some kind of rental house, crticizing that the wastebaskets had not been emptied by the last occupants, the bed had not been made, but somehow most of her possessions had been moved in from her house. She wanted to leave and go to her house, and got very argumentative when I tried to convince her this IS her house. Hospice nurse advised upping xanax dose and try to divert the conversation away from the house. Did givemore xanax, which usually puts her to sleep, but now after two doses of twice her usual, she has not slept a wink and is still angry that I won't take her home. Research tells me this is Capgras syndrome and that I should not try to correct her or argue with her, but she will talk of nothing else. Any thoughts?