What is the plan after she finishes up at the hospital, will you take her back to your home? In any case, I will give you the advice I give to everyone who is leaving after visiting a loved one with dementia: try to leave without telling her you are “going home.” So you could say, “I’m going right now but I’ll be back very soon.” Chances are good that she recovers fairly quickly (no matter what you say) and goes to sleep. You can’t take the guilt on yourself: she has to get better and you can’t possibly stay at the hospital all day and night. I also recommend setting up shorter visitor hours and maybe visiting earlier on in the day. She’s probably sundowning at night which makes your leaving even harder for her.